Area and Circumference of Circles

Find the circumference of a circle with a radius of 12.5 mm .

• 37.68mm

• 18.84mm

• 78.5mm

• none of the above

The circumference is 62.8 inches. What is the radius? (Use 3.14 for π)

• 20 inches

• 10 inches

• 6.28 inches

• 31.4 inches

Find the circumference of a circle with a diameter of 11 millimeters.

• 34.6 mm

• 30 mm

• 25.3 mm

• 34.54 mm

Elsie bought a circular rug that is 9 feet in diameter. What is the circumference of the rug rounded to the nearest tenth of a foot?

• 4.5 feet

• 14.1 feet

• 28.3 feet

• 56.5 feet

What is π ? (Best Choice)

• The ratio of the circumference of any circle to its diameter.

• Exactly 3.14

• Exactly 3.1415

• Exactly 3.141593

A bike tire has a radius of 1.5 feet. How far will the bike go if the wheel rotates around 3 full times? (round your answer to the nearest foot)

• about 28 feet

• about 14 feet

• about 9 feet

• about 5 feet

Find the circumference with a radius of 5.8 cm.

• 37 cm

• 38.3 cm

• 36.4 cm

• 42.7 cm

What is the area of this circle?

• 1256.64 sq. in.

• 31.41 sq. in.

• 314.16 sq. in.

• 123.12 sq. in.

What is the area of this circle?

• 6082.12 sq. ft.

• 1520.53 sq. ft.

• 1893.14 sq. ft.

• 1292.92 sq. ft.

What is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm