Circle Quiz

Label the parts of a circle

(Select all that are correct)

diameter

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• 
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What is the formula needed to find the circumference of a circle?

• c=πr

• d=πr

• c=2πr

• A=πr²

• c=πd

What is the circumference if the radius is 7 inches?

use π = 3.14

• c = 43.96 in

• c = 21.98 in

• c = 153.86 in

• c = 63 in

What is the formula needed to find the area of a circle?

• A=πr

• A=πr²

• A=πd

• A=πd²

What is the area if the radius is 5 yards?

Use π=3.14

• A = 31.4 in²

• A = 15.7 in²

• A = 78.5 in²

• A = 45 in²

Pi is the raito of:

• circumference to diameter

• diameter to circumference

• radius to area

• area to radius

What is the radius if the diameter is 18 yards?

• 9 yd

• 3 yd

• 18 yd

• 36 yd

A merry-go-round has a diameter of 8.5 feet. Which measurement is closest to the circumference of the merry-go-round in feet?

• 26.7 ft

• 53.4 ft

• 13.3 ft

• 48.6 ft

Ryan designed a logo for his interior design company that has a diameter of 12 centimeters. Which measurement is closest to the area of the circular logo in square centimeters?

• 37.7 cm²

• 113.1 cm²

• 452.4 cm²

• 75.4 cm²

Sarah has a circular tablecloth with a ribbon border around the edge. The circumference opf the ribbon border around the table cloth is 8π inches. Which measurement is the closest to the area of the tablecloth in square inches?

• 201.6 in²

• 12.56 in²

• 25.12 in²

• 50.24 in²