Review the following concept if necessary: Working With Circles and Circular Figures Study Guide.

**Working With Circles and Circular Figures Practice Questions**

**Problems**

**Find the approximate circumference of each circle shown or described. Use 3.14 for π.**

*d*= 7 m*r*= 25 m

**Find the approximate area for each circle shown or described. Use 3.14 for π.**

*r*= 13 cm*d*= 24 in

**Find the surface area of each cylinder. Use 3.14 for π.**

- Cylinder:
*r*= 6 ft.,*h*= 16 ft. - Cylinder:
*d*= 18 cm,*h*= 3 cm

**Find the volume of each cylinder shown or described. Use 3.14 for π.**

- Cylinder:
*r*= 3 ft.,*h*= 12 ft. - Cylinder:
*d*= 22 ft.,*h*= 12 ft.

**Find the volume of each cone shown or described. Use 3.14 for π.**

**Find the surface area of each sphere shown or described. Use 3.14 for π.**

- Sphere:
*r*= 16 cm - Sphere:
*r*= 20 ft.

**Find the volume of each sphere. Use 3.14 for π.**

- Sphere:
*r*= 12 m - Sphere:
*d*= 9 ft.

**Answers**

- 47.1 ft.
- 69.08 in.
- 21.98 m
- 157 m
*c*= 25.12 cm- 78.5 ft.
^{2} - 200.96 m
^{2} - 530.66 cm
^{2} - 452.16 in.
^{2} - 12.56 cm
^{2} - 81.64 cm
^{2} - 747.32 in.
^{2} - 828.96 ft.
^{2} - 678.24 cm
^{2} - 1,271.7 cm
^{3} - 339.12 m
^{3} - 339.12 ft.
^{3} - 4,559.28 ft.
^{2} - 100.48 m
^{3} - 340.17 in.
^{3} - 452.16 cm
^{3} - 256.43 ft.
^{3} - 615.44 m
^{2} - 803.84 in.
^{2} - 3,215.36 cm
^{2} - 5,024 ft.
^{2} - 523.3 m
^{3} - 1,436.03 in.
^{3} - 7,234.56 m
^{3} - 381.51 ft.
^{3}

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