Section 13.2: Perimeters of Composite Figures — Practice Questions

1. 1. A semicircle has a diameter of 10 meters. What is the length of its curved edge, in terms of $\pi$? The length is ___ meters.

2. 2. The radius of a semicircle is 7 feet. Calculate the length of its curved boundary, leaving your answer in terms of $\pi$. The length is ___ feet.

3. 3. Which expression represents the length of the curved edge of a semicircle with a diameter of $d$?

   • A. $\pi d$
   • B. $2\pi d$
   • C. $\frac{\pi d}{2}$
   • D. $\pi d^2$

4. 4. A semicircle has a radius of 3 cm. What is the length of its curved edge?

   • A. $6\pi$ cm
   • B. $3\pi$ cm
   • C. $1.5\pi$ cm
   • D. $9\pi$ cm

5. 5. Find the length of the curved portion of a semicircle with a diameter of 14 inches. Express your answer in terms of $\pi$. The length is ___ inches.

6. 6. A circular garden has a radius of 15 meters. What is its circumference in terms of $\pi$? The answer should be in meters. ___

7. 7. The circumference of a car tire is $36\pi$ inches. What is the radius of the tire in inches?

   • A. 9
   • B. 18
   • C. 36
   • D. 72

8. 8. The circumference of a circular tabletop is $52\pi$ cm. What is the diameter of the tabletop in cm? ___

9. 9. A circular plate has a radius of 10 cm and a measured circumference of 62 cm. Using the formula $C = 2\pi r$, what is the estimated value of $\pi$?

   • A. 3.0
   • B. 3.1
   • C. 3.2
   • D. 6.2

10. 10. Circle A has a radius of 8 inches. Circle B has a radius that is double the radius of Circle A. How does the circumference of Circle B compare to Circle A?

    • A. It is half as large.
    • B. It is the same.
    • C. It is twice as large.
    • D. It is four times as large.