# Lesson 12.1 Skills Practice

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1 Lesson 12.1 Skills Practice Name Date Introduction to Circles Circle, Radius, and Diameter Vocabulary Define each term in your own words. 1. circle A circle is a collection of points on the same plane equidistant from the same point. 2. center of a circle The center of a circle is the point from which all points on the circle are equidistant. 3. radius of a circle The radius of a circle is a line segment formed by connecting a point on the circle and the center of the circle. 4. diameter of a circle The diameter of a circle is a line segment formed by connecting two points on the circle such that the line segment passes through the center point. Problem Set Use the circle shown to answer each question. 1. Name the circle. The circle shown is Circle B. 2. Identify a radius of the circle. Sample answer. A B C E Line segment AB is a radius of the circle. F 3. Identify a diameter of the circle. Sample answer. Line segment EF is a diameter of the circle. D Chapter 12 Skills Practice 789

2 Lesson 12.1 Skills Practice page 2 4. Name the circle. The circle shown is Circle A. F B 5. Identify a radius of the circle. E A C Sample answer. Line segment AC is a radius of the circle. G D 6. Identify a diameter of the circle. Sample answer. Line segment CE is a diameter of the circle. 7. Identify a different diameter of the circle. Sample answer. Line segment FG is a diameter of the circle. 8. Name the circle. The circle shown is Circle C. B D 9. Identify a radius of the circle. Sample answer. Line segment BC is a radius of the circle. A C E 10. Identify a diameter of the circle. Sample answer. Line segment AD is a diameter of the circle. F 790 Chapter 12 Skills Practice

3 Lesson 12.1 Skills Practice page 3 Name Date Determine if the circles are congruent. 11. B A C D E Line segment AB is a radius of Circle A and is 2 centimeters. Line segment CE is a diameter of Circle D and is 4 centimeters. The diameter of Circle A equals 4 centimeters. The diameter of Circle A equals the diameter of Circle D. Circle A and Circle D are congruent. 12. B D A C Line segment AB is a radius of Circle A and is 7 inches. Line segment CD is a radius of Circle C and is 12 inches. The radius of Circle A does not equal the radius of Circle C. Circle A and Circle C are not congruent. Chapter 12 Skills Practice 791

5 Lesson 12.1 Skills Practice page 5 Name Date Construct each figure using congruent circles. 19. Construct an equilateral triangle using congruent circles. A B C 20. Construct an equilateral quadrilateral using congruent circles. B A C D 21. Construct an equilateral hexagon using congruent circles. B C A F E D Chapter 12 Skills Practice 793

6 794 Chapter 12 Skills Practice

7 Lesson 12.2 Skills Practice Name Date But Most of All, I Like Pi! Circumference of a Circle Vocabulary Define the term in your own words. 1. pi The number pi (p) is the ratio of the circumference of a circle to its diameter. Problem Set Use a string and a centimeter ruler to measure the radius and circumference of each circle. Calculate the ratio of the circumference of the circle to its diameter. 1. A Answers will vary. The ratio should be B 3. Answers will vary. The ratio should be C Answers will vary. The ratio should be Chapter 12 Skills Practice 795

8 Lesson 12.2 Skills Practice page 2 4. D Answers will vary. The ratio should be E Answers will vary. The ratio should be F Answers will vary. The ratio should be Chapter 12 Skills Practice

9 Lesson 12.2 Skills Practice page 3 Name Date Calculate each value using the formula for the circumference of a circle. Round your answer to the nearest hundredth, if necessary. 7. The diameter of a circle is 6 centimeters. Calculate the circumference of the circle using the circumference formula. Let p C 5 pd C 5 (3.14)(6) C The circumference of the circle is centimeters. 8. The radius of a circle is 8.2 centimeters. Calculate the circumference of the circle using the circumference formula. Let p C 5 2pr C 5 2(3.14)(8.2) C The circumference of the circle is approximately centimeters. 9. The diameter of a circle is 7.5 inches. Calculate the circumference of the circle using the circumference formula. Let p C 5 pd C 5 (3.14)(7.5) C The circumference of the circle is inches. Chapter 12 Skills Practice 797

10 Lesson 12.2 Skills Practice page The radius of a circle is 16.3 millimeters. Calculate the circumference of the circle using the circumference formula. Let p C 5 2pr C 5 2(3.14)(16.3) C The circumference of the circle is approximately millimeters. 11. The diameter of a circle is 14 centimeters. Calculate the circumference of the circle using the circumference formula. Let p C 5 pd C 5 (3.14)(14) C The circumference of the circle is centimeters. 12. The radius of a circle is 2.1 inches. Calculate the circumference of the circle using the circumference formula. Let p C 5 2pr C 5 2(3.14)(2.1) C The circumference of the circle is approximately inches. 798 Chapter 12 Skills Practice

11 Lesson 12.2 Skills Practice page 5 Name Date Calculate each value using the formula for the circumference of a circle. Round your answer to the nearest hundredth, if necessary. 13. The circumference of a circle is 56 centimeters. Calculate the diameter of the circle using the circumference formula. Let p C 5 pd 56 5 (3.14)d d d The diameter of the circle is approximately centimeters. 14. The circumference of a circle is centimeters. Calculate the radius of the circle using the circumference formula. Let p C 5 2pr (3.14)r r 4 5 r The radius of the circle is 4 centimeters. Chapter 12 Skills Practice 799

12 Lesson 12.2 Skills Practice page The circumference of a circle is millimeters. Calculate the diameter of the circle using the circumference formula. Let p C 5 pd (3.14)d d The diameter of the circle is approximately millimeters. 16. The circumference of a circle is 49.6 inches. Calculate the radius of the circle using the circumference formula. Let p C 5 2pr (3.14)r r 7.90 r The radius of the circle is approximately 7.90 inches. 800 Chapter 12 Skills Practice

13 Lesson 12.2 Skills Practice page 7 Name Date 17. The circumference of a circle is millimeters. Calculate the diameter of the circle using the circumference formula. Let p C 5 pd (3.14)d d The diameter of the circle is approximately millimeters. 18. The circumference of a circle is centimeters. Calculate the radius of the circle using the circumference formula. Let p C 5 2pr (3.14)r r 9 5 r The radius of the circle is 9 centimeters. Chapter 12 Skills Practice 801

14 802 Chapter 12 Skills Practice

15 Lesson 12.3 Skills Practice Name Date One Million Sides Area of a Circle Vocabulary Define the term in your own words. 1. inscribed circle An inscribed circle is a circle that fits exactly within the boundaries of another shape. It is the largest possible circle that will fit inside a plane figure. Problem Set Use the figure to answer each question. Let p Round your answer to the nearest hundredth, if necessary. 5.5 cm 1.5 cm 1. Use a centimeter ruler to measure the sides of the equilateral triangle. Then calculate the perimeter of the equilateral triangle. P 5 3s P 5 3(5.5) P The perimeter of the triangle is 16.5 centimeters. Chapter 12 Skills Practice 803

16 Lesson 12.3 Skills Practice page 2 2. Use a centimeter ruler to measure the radius of the inscribed circle. Then calculate the circumference of the inscribed circle. C 5 2pr C 5 2(3.14)(1.5) C The circumference of the inscribed circle is 9.42 centimeters. 3. Calculate the area of the equilateral triangle in terms of the perimeter. A Pr A (16.5)(1.5) A < The area of the triangle is approximately square centimeters. 4. Calculate the area of the inscribed circle. A 5 (3.14)(1.5) 2 A < 7.07 The area of the inscribed circle is approximately 7.07 square centimeters. 804 Chapter 12 Skills Practice

17 Lesson 12.3 Skills Practice page 3 Name Date Use the figure to answer each question. Let p Round your answer to the nearest hundredth, if necessary. 7 cm 3.5 cm 5. Use a centimeter ruler to measure the sides of the square. Then calculate the perimeter of the square. P 5 4s P 5 4(7) P 5 28 The perimeter of the square is 28 centimeters. Chapter 12 Skills Practice 805

18 Lesson 12.3 Skills Practice page 4 6. Use a centimeter ruler to measure the radius of the inscribed circle. Then calculate the circumference of the inscribed circle. C 5 2pr C 5 2(3.14)(3.5) C The circumference of the inscribed circle is centimeters. 7. Calculate the area of the square in terms of the perimeter. A Pr A (28)(3.5) A 5 49 The area of the square is 49 square centimeters. 8. Calculate the area of the inscribed circle. A 5 (3.14)(3.5) 2 A < The area of the inscribed circle is approximately square centimeters. 806 Chapter 12 Skills Practice

19 Lesson 12.3 Skills Practice page 5 Name Date Use the figure to answer each question. Let p Round your answer to the nearest hundredth, if necessary. 4 cm 2.75 cm 9. Use a centimeter ruler to measure the sides of the equilateral pentagon. Then calculate the perimeter of the equilateral pentagon. P 5 5s P 5 5(4) P 5 20 The perimeter of the pentagon is 20 centimeters. Chapter 12 Skills Practice 807

20 Lesson 12.3 Skills Practice page Use a centimeter ruler to measure the radius of the inscribed circle. Then calculate the circumference of the inscribed circle. C 5 2pr C 5 2(3.14)(2.75) C The circumference of the inscribed circle is centimeters. 11. Calculate the area of the equilateral pentagon in terms of the perimeter. A Pr A (20)(2.75) A The area of the pentagon is 27.5 square centimeters. 12. Calculate the area of the inscribed circle. A 5 (3.14)(2.75) 2 A < The area of the inscribed circle is approximately square centimeters. 808 Chapter 12 Skills Practice

21 Lesson 12.3 Skills Practice page 7 Name Date Use the figure to answer question. Let p Round your answer to the nearest hundredth, if necessary. 4 cm 3.35 cm 13. Use a centimeter ruler to measure the sides of the equilateral hexagon. Then calculate the perimeter of the equilateral hexagon. P 5 6s P 5 6(4) P 5 24 The perimeter of the hexagon is 24 centimeters. Chapter 12 Skills Practice 809

22 Lesson 12.3 Skills Practice page Use a centimeter ruler to measure the radius of the inscribed circle. Then calculate the circumference of the inscribed circle. C 5 2pr C 5 2(3.14)(3.5) C The circumference of the inscribed circle is centimeters. 15. Calculate the area of the equilateral hexagon in terms of the perimeter. A Pr A (24)(3.5) A 5 42 The area of the hexagon is 42 square centimeters. 16. Calculate the area of the inscribed circle. A 5 (3.14)(3.5) 2 A < The area of the inscribed circle is approximately square centimeters. 810 Chapter 12 Skills Practice

23 Lesson 12.4 Skills Practice Name Date It s About Circles! Unknown Measurements Problem Set Use the area and circumference formulas to answer each question. Let p Round your answer to the nearest hundredth, if necessary. 1. Jaleesa is buying a round backyard pool. The distance around the edge of the pool is 38 feet. Find the area that the pool will cover. C 5 2pr (3.14)r r 6.05 < r A 5 (3.14)(6.05) 2 A < The pool will cover about square feet. Chapter 12 Skills Practice 811

24 Lesson 12.4 Skills Practice page 2 2. Belinda is digging a round flower garden in her backyard. She has 19 feet of rubber edging to place around the garden. What is the area of the new garden? C 5 2pr (3.14)r r 3.03 < r A 5 (3.14)(3.03) 2 A < The new garden has an area of about square feet. 3. Carlos is spreading mulch in a circle on top of an area where he has planted some seeds. He has enough mulch to cover an area that is 12.5 square feet. How much rubber edging does Carlos need to encircle the mulch that will cover the seeds? (3.14)r < r < r C 5 2pr C 5 2(3.14)2.00 C Carlos needs feet of rubber edging. 812 Chapter 12 Skills Practice

25 Lesson 12.4 Skills Practice page 3 Name Date 4. Jose is adding mulch to an existing round flower bed. The length of the rubber edging around the flower bed is feet. What is the area that Jose needs to cover with mulch? C 5 2pr (3.14)r r 4 5 r A 5 (3.14)(4) 2 A The area that Jose needs to cover with mulch is square feet. 5. Eva is decorating for a birthday party. She would like to add a paper streamer around the edge of a round table. The table covers an area of 19.5 square feet. What is the minimum length of the paper streamer Eva needs? (3.14)r < r < r C 5 2pr C 5 2(3.14)(2.49) C < Eva needs at least feet of the paper streamer. Chapter 12 Skills Practice 813

26 Lesson 12.4 Skills Practice page 4 6. Nami is adding a mosaic pattern to the top of a small round table. The distance around the edge of the table top is 4.7 feet. What is the area that Nami needs to cover with the mosaic pattern? C 5 2pr (3.14)r r 0.75 < r A 5 (3.14)(0.75) 2 A < 1.77 The area that Nami needs to cover with the mosaic pattern is 1.77 square feet. 814 Chapter 12 Skills Practice

27 Lesson 12.4 Skills Practice page 5 Name Date Find the area of each shaded region. Let p Round your answer to the nearest hundredth, if necessary. 7. s = 5.5 cm r = 1.5 cm Area of the triangle: A Pr A 5 1 ( )(1.5) 2 A < Area of the circle: A 5 (3.14)(1.5) 2 A < 7.07 Area of the shaded region 5 Area of the triangle 2 Area of the circle < < 5.31 The area of the shaded region is approximately 5.31 square centimeters. Chapter 12 Skills Practice 815

28 Lesson 12.4 Skills Practice page 6 8. s = 10 cm r = 2.5 cm Area of the square: A 5 s 2 A 5 (10) 2 A Area of the circle: A 5 (3.14)(2.5) 2 A < Area of the shaded region 5 Area of the square 2 Area of the circle The area of the shaded region is square centimeters. 816 Chapter 12 Skills Practice

29 Lesson 12.4 Skills Practice page 7 Name Date 9. s = 18 cm r = 6 cm Area of the pentagon: A Pr A 5 1 (5 3 18)(6) 2 A Area of the circle: A 5 (3.14)(6) 2 A Area of the shaded region 5 Area of the pentagon 2 Area of the circle The area of the shaded region is square centimeters. Chapter 12 Skills Practice 817

30 Lesson 12.4 Skills Practice page r = 3 cm r = 3 cm Area of the square: Area of one circle: s A 5 (3.14)(3) 2 A 5 s 2 A A 5 (12) 2 A Area of both circles Area of the shaded region 5 Area of the square 2 Area of the circles The area of the shaded region is square centimeters. 818 Chapter 12 Skills Practice

31 Lesson 12.4 Skills Practice page 9 Name Date cm 5 cm 4 cm Area of the rectangle: A 5 l 3 w A A 5 12 Area of the circle: r 5 d 2 r r A 5 (3.14)(2.5) 2 A < Area of the shaded region 5 Area of the circle 2 Area of the rectangle The area of the shaded region is 7.63 square centimeters. Chapter 12 Skills Practice 819

32 Lesson 12.4 Skills Practice page r = 4 cm r = 8 cm Area of the large circle: Area of the medium circle: d 5 24 r 5 d 2 r r 5 12 A 5 (3.14)(8) 2 A Area of the small circle: A 5 (3.14)(12) 2 A 5 (3.14)(4) 2 A A Area of the shaded region 5 Area of the large circle 2 Area of the smaller circles ( ) The area of the shaded region is square centimeters. 820 Chapter 12 Skills Practice

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