6.3A Lesson: How Many Diameters Does it Take to Wrap Around a Circle?*
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1 6.3A Lesson: How Many Diameters Does it Take to Wrap Around a Circle?* Name: Period: Label the center of the circle, C. Draw and label the radius,. Draw and label the diameter,. Term Definition Example Circle Radius Diameter Area SDUHSD Math A Honors Module #6 STUDENT EDITION 52
2 1. Create one circle using either a) manual construction: a compass, tracing the base of a cylindrical object, or using a string compass, OR b) technology: Geogebra, etc. (technology will allow for far more accurate measurement). Then, measure the circumference and diameter of the circle; collect measurements from five other students to fill in the table below. Measurement of the diameter in units Measurement of the circumference in units (must be the same units as the diameter) Ratio of circumference : diameter (C/d), as a decimal rounded to the nearest hundredth. Note: C represents circumference and d represents diameter. 2. What do you notice about the values in the third column? Term Definition Symbol Approximations Pi 3. If you made a huge circle the size of a city and measured the diameter and circumference, would the ratio of circumference to diameter (C/d) be consistent with the other ratios in the third column of the table? Justify your answer using what you learned from the previous section. 4. Write and justify a formula for circumference, in terms of the diameter. 5. If you know the diameter of a circle is 5 inches, what is the approximate measure of the circumference to the nearest tenth? 6. Write and justify a formula for the circumference, in terms of the radius. SDUHSD Math A Honors Module #6 STUDENT EDITION 53
3 of a Circle C = C =, where d is the diameter of the circle., where r is the radius of the circle. 7. For each of the three circles below, calculate the circumference of the circle. Express your answer both in terms of, and also as an approximation to the nearest hundredth. Please note: drawing is not to scale. Diameter/Radius (in terms of ) Radius = 0.5 cm Diameter = 2.5 cm 8. If the circumference of a circle is 8 (approximately 25.1) inches, which of the following is true? Rewrite false statements to make them true. a. The ratio of : Diameter is 8. b. The radius of the circle is the circumference. c. The diameter of the circle is twice the radius. d. The radius of the circle is 8 inches. e. The diameter of the circle is 8 inches. SDUHSD Math A Honors Module #6 STUDENT EDITION 54
4 9. The circumference of 2 objects is given. Calculate the diameter of each object, to the nearest tenth of a unit. Diameter Car tire = 78.1 inches Lid = 11 inches 10. The diameter or radius of 2 objects is given. Calculate the circumference of each object, to the nearest tenth of a unit. Diameter/Radius Radius of clock face = 11 Diameter of the High Roller Ferris wheel in Las Vegas = When a unicyclist pedals once, the wheel makes one full revolution, and the unicycle moves forward the same distance along the ground as the distance around the edge of the wheel. If Daniel is riding a unicycle with a diameter of 20 inches, how many times, to the nearest whole number, will he have to pedal to cover a distance of 50 feet? Show all your work. SDUHSD Math A Honors Module #6 STUDENT EDITION 55
5 12. Randy s circular garden has a radius of 1.5 feet. He wants to enclose the garden with edging that costs $0.75 per foot. About how much will the edging cost to surround the entire garden? Explain. 13. A circular pool has a circumference of feet. A toy boat is moving directly across the pool, along a radius, at a rate of 5 feet per second. How long does it take the boat to get from the edge of the pool to the center? a. Find the radius. Round to the nearest whole number. b. Find the time it takes the boat to get from the edge of the pond to the center along the radius. 14. The diameter of a bicycle wheel is two feet. About how many revolutions, to the nearest whole number, does the wheel make to travel 2 km. Explain. (Hint: 1 km 3,280 ft) 15. A map of a public park shows a circular pond. There is a bridge along a diameter of the pond that is 0.25 miles long. You walk across the bridge, while your friend walks halfway around the pond to meet you at the other side of the bridge. How much farther does your friend walk? Round to the nearest hundredth of a mile. (Hint: make a drawing) SDUHSD Math A Honors Module #6 STUDENT EDITION 56
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