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Diameter and Radius
Circumference of a Circle
Area of a Circle
Mixed Practice
Random
100
If you are given the radius, how can you find the diameter?
Multiply radius by two
100

What is one formula for circumference of a circle?

Pi x d or 2 x pi x r

100

What is the formula for the area of a circle?

A=pi x r2

100

Decide for the following scenario if you would need to find the Circumference or Area?

The distance your car will go with one rotation of the wheels.

Circumference

100
What numerical value is used for pi in the equation for area and circumference of circles?
3.14
200
If given the diameter, how can you find the radius?
Divide the diameter by two
200

What is the circumference of a circle with a diameter of 14.8 cm?

14pi or 46.5 cm

200

What is the area of a circle with a radius of 15 cm?

706.86 cm2

200

True or False: Diameter and Circumference are a proportional relationship.

True

200
What is the relationship between the radius and diameter of a circle?
Radius is half the diameter. OR Diameter is two times the radius
300
If a circle has a radius of 15 cm, what is the diameter?
30 cm
300

What is the circumference of a circle with a diameter of 41.3 cm?

41.3pi or 129.75 cm

300

What is the area of circle with radius 39 cm?

4778.36 cm2

300

What is the circumference of the following picture? (See Google Doc)


7pi or 21.99/22 units

300

Is the exponent, 2, used in the equation for area or circumference of a circle?

Area

400
If a circle has a diameter of 31 ft, what is the radius?
15.5 ft
400

What is the circumference of a circle with a radius of 19.7cm?

39.4pi or 123.78 cm

400

What is the area of a circle with diameter 24.8 in?

483.05 in2

400

What is the area of the following picture? (See Google Doc)

78.54 units2

400

What is the diameter of a circle if the circumference is 78.5 ft?

24.99 ft

500

A circle has a circumference of 62.8 ft, what is the diameter?

19.99 ft

500

What is the circumference of a circle with radius 23.25 in?

46.5pi or 146.08 in

500

What is the area of a circle with diameter 23.78 in?

444.13 in2

500

What is the area of the following picture? (See Google Doc)

84.825 units2

500

What are two ways we can write the formula for circumference of a circle?

Pi x d OR 2Pi x r