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Circle Terms
Finding Radius
Finding Diameter
Finding Circumference
Finding Area
100

The distance from the center of a circle to the edge of the circle.

Radius

100

What is the radius of a circle if the diameter is 6 mm?

3 mm

100

What is the diameter if the radius is 4.5 ft?

9 ft

100

How do you find the circumference of a circle if only given the radius?

Radius x 2 x 3.14

100
How do you find the area of a circle if you are only given the diameter?

Divide the diameter by 2 to get the radius. Then take radius x radius x 3.14.

200

The distance around a circle.

Circumference

200

What is the radius of a circle if the diameter is 19 ft?

9.5 ft

200

What is the diameter is the radius is 456.89 m?

913.78 m

200

What is the circumference of a circle if the diameter is 30 m?

94.2 m

200

What is the area of a circle if the radius is 4.5 cm?

63.585 cm2

300
This line goes all the way across the circle and crosses through the center.

Diameter

300

What is the radius of a circle if the circumference is 31.4 m?

5 m

300

What is the diameter of a circle if the circumference is 47.1 ft?

15 ft

300

What is the circumference of a circle if the radius is 13.5 ft?

84.78 ft

300

What is the area of a circle if the diameter is 20 ft?

314 ft2

400

The total amount of space inside of a circle

Area

400

What is the radius of a circle if the circumference is 301.44 in?

48 in

400

What is the diameter of a circle if the circumference is 82.582 cm?

26.3 cm

400

What is the circumference of a circle if the diameter is 3/4 ft?

2.355 ft

400

What is the area of a circle if the radius of this circle is 52.4 m.

8,490.56 m2

500

What is the term for 3.14?

Pi

500

What is the radius of a circle if the diameter is 3/5 yd?

0.3 or 3/10 yd

500

What is the diameter of a circle if the radius is 1/4 yd?

1/2 yd

500

What is the circumference of a circle if the radius is 68.7 mm?

431.436 mm

500

What is the area of a circle if the diameter is 34 cm?

907.46 cm2