# Lesson 21. Circles. Objectives

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1 Student Name: Date: Contact Person Name: Phone Number: Lesson 1 Circles Objectives Understand the concepts of radius and diameter Determine the circumference of a circle, given the diameter or radius Determine the area of a circle, given the diameter or radius

2 Authors: Jason March, B.A. Tim Wilson, B.A. Editor: Graphics: Linda Shanks Tim Wilson Jason March Eva McKendry National PASS Center BOCES Geneseo Migrant Center 7 Lackawanna Avenue Mount Morris, NY (585) (585) (fax) Developed by the National PASS Center under the leadership of the National PASS Coordinating Committee with funding from the Region 0 Education Service Center, San Antonio, Texas, as part of the Mathematics Achievement = Success (MAS) Migrant Education Program Consortium Incentive project. In addition, program support from the Opportunities for Success for Out-of-School Youth (OSY) Migrant Education Program Consortium Incentive project under the leadership of the Kansas Migrant Education Program.

3 Imagine you have just gotten a new dog, Milo. You know that you cannot t let him roam free in the yard because he would run away. You get a 10-ft. line of rope, and tie Milo to a post in the middle of the yard. After you tie him up, he stretches the rope out as far as it goes and walks around. Milo 10 ft. Post As you can see, Milo has walked in a circle. A circle is not a polygon,, because it is not made of straight line segments.. In a polygon, line segments are used to determine the dimensions. A circle has no sides. How do we find the dimensions of a circle? What s interesting about circles is that they are all the same shape. (Therefore, they are all similar to one another!) They are all round. The only difference between circles is their size. Thinking ing of circles in this way, what would happen if you tied Milo up with a 5 ft. length of rope? 10 ft. 5 ft. Math On the Move Lesson 1 1

4 If we tie Milo up with a shorter piece of rope, the circle becomes smaller. So, the dimension that changes the size of the circle is the length of the t rope. The length of the rope represents the radius of the circle. The radius of a circle is the distance from the center of the circle to the edge of the circle. The plural form of radius is radii (ray-dee dee-eye). radius The radius of the larger circle is 10 ft., and the radius of the smaller circle is 5 ft. The diameter of a circle is directly related to its radius. The diameter is the distance across a circle that runs through the center of the circle. diameter The diameter is twice the length of the radius. If d = diameter and r = radius, then d = r. Example Find the length of the diameter of the following circles. a) b) c) 3 in. 17 mm 9 yds. Math On the Move

5 Solution To solve each of these problems, remember that the diameter is always twice the radius. a) r = 3 in., so d = 3 in. = 6 in. so d = r b) r = 17 mm, so d = 17 mm = 34 mm. = 17 mm, so c) r = 9 yds., so d = 9 yds. = 18 yds. = 9 yds., so 1. Find the diameter of a circle with radius.5 units. Find the radius of the following circles ft. 13 m in. 11 Math On the Move Lesson 1 3

6 After several days,, you feel bad for tying your dog, Milo, up in the back yard.. You decide to build a circular pen for him to play in. He was tied up with a 10-ft. length of rope. You want to build the pen slightly larger. You want the radius r of the pen to be 1 ft. You need to figure out the length of fence you will need to build the pen. The length of fence needed will be the distance all the way around the circular pen. The distance all the way around a circle is called the circumference. 1 ft. The circumference of a circle is the length around the outer edge of a circle. The circumference of a circle is similar to the perimeter of a polygon. To find the circumference, we use a formula directly related to the radius and diameter. Remember: when Milo s rope was longer, the circle was bigger. When the radius of a circle increases, so does the circumference. Also, remember that the diameter is directly related to the radius. When the radius increases, so does the diameter. The formula we use for the circumference of a circle is: C = π d C = circumference; π = pi; d = diameter. The symbol π is actually the Greek letter, pi (rhymes with sky ).. In math, it denotes the number you get when a circle s circumference is divided by its diameter. Pi is not a variable, it is always the same number. π Math On the Move 4

7 Pi is a number that never ends and never repeats. The first 5 decimal places of pi are For our purposes, we use the values 3.14 and to estimate pi. 7 You want to build a circle with a radius of 1 ft. How can we find the circumference of a circle if we only have the radius? the radius is 1 ft., the diameter is 4 ft. ( d r Since the radius is 1 ft., the diameter is 4 ft. = = 1 = 4 ft. ) With the given information, n, we can find the circumference of the pen. C = π d = 4π ft. The circumference around the dog s pen will be about ft. This means you will need ft. of fencing. Example Madeline is building a circular swimming pool in her back yard. She wants the diameter of the pool to be 30 ft. If pool walling costs \$1 per foot, how much will it i t cost Madeline to put up a pool? Solution First, we must find how many feet of pool wall Madeline needs to build her circular pool. Since we know the diameter of her pool, we can determine the circumference of the pool. C = π d = 30π = 94. ft. The circumference tells us how many feet go around the whole pool, which means we know how many feet of wall she needs. Madeline needs 94. ft. of wall to go around her pool. Math On the Move Lesson 1 5

8 Next, we need to find how much 94. ft. of wall will cost. If the wall costs \$1 per foot, we need to multiply the price per foot by the total number of feet. \$1 94. = \$1, It will cost Madeline \$1, to build her round pool. Sometimes drawing a picture makes it easier to solve these problems. Try some circumference problems on your own. 6. Miguel ran around a circular track 5 times. If the radius of the circle is 60 meters, how far did he run? (Use π 3.14 ) 7. Ana just bought a new bike. The tires on her bike have a diameter of 55 cm. Ana wants to know what the circumference of the tire is. (Use π 7 ) Round to the nearest hundredth. 8. Tomás s just found that t the circumference of the clock in town is 30 meters. Tomás s wants to know what the diameter of the clock is. (Use π 3.14 ) Round to the nearest tenth. Let s go back to the story of Milo, the dog. After you finish building the circular pen for Milo, you wonder how many square feet of land are inside it.. Now, you are looking for the area of the circle. Math On the Move 6

9 As with circumference, area is dependent on the radius of the circle. If the radius of the circle increases, so does the area. Area = pi The area formula for circles is ( radius) or A = π r So, to find the area of the circular pen built for Milo, you need the radius. You made the pen with a radius of 1 ft., so plug that into the formula. A π r π 1 144π = = = = sq. ft. The area of Milo s pen is sq. ft. Think Back When we wrote numbers next to variables, we wrote the number first. This rule applies for a number next to pi, as well. Example Madeline built her swimming pool with a diameter of 30 ft. She wants to buy a pool cover, so she s needs to know how many square feet the pool s surface is. Solution The easiest way to solve this problem is by drawing a picture. 30 ft. She must find the area of this circle in order to get the right sized pool cover. First, she needs to find the radius of the pool. Since the diameter of the pool is 30 feet, then the radius is half of that, or 15 ft. Math On the Move Lesson 1 7

10 Then, she plugs the radius into the area formula for circles. A π r π 15 5π = = = = sq. ft. So, Madeline s pool is sq. ft. Now she knows what size pool cover to get. Find the area of the following circles. Use π , and round to the nearest digit. 13 dm 3 m Sometimes, math problems involve a combination of shapes and circles. Math On the Move 8

11 Example The high school track goes around the football field as shown below. Given the dimensions, what is the distance around the track? 10 m 51 m 51 m Solution To solve this problem, we must figure out what shape we are looking at. If we break apart the diagram into familiar shapes, we get this: As we can see, the track is made of a rectangle and two semicircles. First, we will find the distance around the rectangular portion of the track. Math On the Move Lesson 1 9

12 10 m 10 m The distance along the rectangular portion of the track is = 40 meters. Next, we will find the distance around the two semicircles. Because the two semicircles have the same diameter, we can put them together to make a full circle. 51 m 51 m 51 m Math On the Move 10

13 The circumference of the circle,, then, is C = π d = 51π = m If the distance around the circular part of the track is m, and the distance around the rectangular part of the track is 40 m, then the total distance is = m. Example Suppose your friend Jorge was asked to cut the grass inside the track. How many square meters of grass does he have to cut? Solution To solve this problem, we have to break down the area into familiar shapes again. 10 m 51 m 51 m We must find the area of the shaded region, which is made of a rectangle and two semicircles. First,, we find the area of the rectangular portion. The rectangle has a base of 10 meters and a height of 51 meters, so the area of the rectangle is 610 m = 610 m Math On the Move Lesson 1 11

14 10 m 51 m 610 m 51 m Next,, we find the area of the two t semicircles. Again, the two semicircles have the same diameter. We can put them together to make a full circle. 51 m 51 m 51 m To find the area of this circle, we need the radius first. If the diameter is 51 meters, the radius is half of that. t. The radius is 5.5 meters. We plug the radius into the area formula for circles. A π r π π = = = = m Math On the Move 1

15 Finally, we add the area of the rectangle to the area of the semicircles. The total area inside the track is, = m As s before, when we find the area of a figure, our answer is in square units. The distance around an object (circumference or perimeter) is just in units. The circumference and area formulas can be very hard to remember because they both have the number pi in them. To make them easier to remember, use the saying: Cherry pie is delicious. Apple pies are too. C = π d A = πr When you say the two phrases together, it flows well. Say the sentences and formulas out loud a couple of times. Cherry pie is i s delicious, apple pies are too. C = π d A = π r Try these problems. Add the areas of familiar objects. Find the area of the following objects. Use π = m 4 ft. 6 ft. Math On the Move Lesson 1 13

16 Review 1. Find the definitions of the following terms, and highlight them in the lesson. a. radius b. diameter c. circumference d. pi (π ). Write one question you would like to ask your mentor, or one new thing you learned ed in this lesson. Practice Problems Math On the Move Lesson 1 Directions: Write your answers in your math journal. Label this exercise Math On the Move Lesson 1,, Set A and Set B. Set A C 1. Using the diagram of circle O, a) name a diameter b) name all radii A O B. If the circle O has a radius of 6 mm. Find the length of: a) AB D b) CO Math On the Move 14

17 3. Find the area and circumference of the following circles. (Round to the nearest tenth) a) b) 3 km 7 in. 4. Danny found the area of the circle, but feels his answer is not right. What did Danny do wrong? What is the actual area of the circle? Name: Danny 10 m Radius = 10 m A = πr A = π ( 10 ) A = 0 π = 68. A = Set B 1. You own a pizza p shop. A customer comes in and asks what the area of a single slice of pizza is. You know that a whole pizza has a diameter of 1 inches, and that each pizza is cut into 8 equal slices. Find the area of one slice. Hint: (Hint : Draw a picture to help). What is the area of the shaded ring? 9 6 yd. Math On the Move Lesson 1 15

18 1. 5 units. 4 ft m 4. 3 in units C = π d = 10π 6. In the circle, the diameter is 10, so. The circumference of the track is = m m. If Miguel went around 5 times, he ran = 1884 m. C = π d = 55π 7. The diameter d is 55, so = cm The circumference is given, and we are looking for the diameter. We know the formula is C = π d, and since we know the circumference, we need to divide the circumference by pi to get the diameter m m dm ft m End of Lesson 1 Math On the Move 16

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