# Circle Calculations (Grade 8)

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## Circle Calculations

1.

A rose garden is in the shape of a circle with a circumference of approximately 37.7 feet. 11.8 is closest to the diameter of the rose garden. (Use 3.14 for pi).

- True
- False

2.

A square is inscribed in a circle with a radius of 5 cm. Each vertex of the square lies on the circle. Therefore, the area of the square is 75 sq. cm.

- True
- False

3.

Use 3.14 for [math]pi[/math]. If the diameter of a circle is 28.1 yd, what is the circumference of the circle?

- 44.1 yd
- 176.5 yd
- 25.0 yd
- 88.2 yd

4.

Use 3.14 for [math]pi[/math]. Find the circumference of a circle when the diameter is 3.5 m.

- 5.5 m
- 11.0 m
- 22.0 m
- 34.5 m

5.

Find the circumference of a circle with a radius of 6 inches. (Use 3.14 for Pi)

- 37.68 inches
- 18.84 inches
- 9.42 inches
- 9.14 inches

6.

Given a radius is 6.1 mm and use 3.14 for [math]pi[/math], what is the circumference of the circle?

- 19.2 mm
- 9.6 mm
- 38.3 mm
- 60.1 mm

7.

Given the radius of a circle is 8.6 cm and using 3.14 for [math]pi[/math], the circumference of the circle is .

- 13.5 cm
- 54.0 cm
- 27.0 cm
- 84.8 cm

8.

The circle has an area of 120.8 m squared. What is the circumference of the circle?

- 6.2 m
- 39.0 m
- 19.5 m
- 46.2 m

9.

Suppose you are constructing a circle graph. If you have a central angle that measures 120 degrees, what percent of the whole does the central angle represent?

- 33.3%
- 30%
- 50%
- 66.7%

10.

Suppose you are constructing a circle graph. What is the angle measure of a piece that represents 40% of the total?

- 40 degrees
- 144 degrees
- 100 degrees
- 360 degrees

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