Circumference Review

Terms

100

Define circumference. 

The distance around the edge of a circle

200

What is the numerical value of pi?

3.14

300

What part of a circle is the distance from one point  to another point on the circle, and crosses through the center?

Diameter

400

What part of a circle is a straight line extending from the center  to the circumference?

Radius

500

What are the formulas used to find the circumference of a circle?

C = 2π4

C = πd

Find the Radius

100

What is the formula to find the radius of a circle?

r = d/2

200

The diameter of a circle is 5cm. What is the radius?

r = 2.5cm

300

The diameter of a circle is 23mm. What is the radius?

r = 11.5mm

400

The diameter of a circle is 245ft. What is the radius?

r = 122.5ft

500

C = 109.9 ft

What is the radius?

r = 17.5 ft

Find the Diameter

100

What is the formula to find the diameter of a circle?

d = 2r

200

The radius of a circle in 21 in. What is the diameter?

d = 42 in

300

The radius of a circle is 12 mm. What is the diameter?

d = 24 mm

400

The radius of a circle is 73in. What is the diameter of the circle?

d = 146in

500

C = 301.44 in

Find the diameter of the circle

d = 96 in

Find the Circumference

100

The diameter of a circle is 17 units. Find the circumference of the circle.

53.38 units

200

The radius of a circle is 8m. What is the circumference?

50.24m

300

The diameter of a circle is 22 units. What is the circumference?

69.08 units

400

The diameter of a circle is 14 in. What is the circumference?

43.96 in

500

The radius of a circle is 357cm. What is the circumference?

2,241.96cm

# squared

100

4²

16

200

7²

49

300

15²

225

400

23²

529

500

36²

1,296