Area and Circumference of Circles

What is the radius of this circle?

• 18

• 36

• 9

• 6

What is the diameter of this circle?

• 3.5

• 6.5

• 6

• 7

What is the circumference of a circle with a diameter of 40 in? 

• 125.6 in

• 35.17 in

• 28.67 in

• 47.17 in

A minute hand (radius) of a clock is 13.8 meters long. What is the circumference of the clock?

• 86.66 meters

• 76.66 meters

• 66.66 meters

• 96.66 meters

What is the circumference of a circle with a radius of 21 cm?

• 131.9 cm

• 121.9 cm

• 111.9 cm

• 141.9 cm

The circumference of a circle is

• The measurement from an edge of a circle to another edge.

• The measurement around the circle

• The measurement from an edge of a circle to another edge going through the center

• The measurement from the center of the circle to an edge of the circle

find the area of the circle below.

• 100 cm

• 225 cm

• 9 cm

• 28.26 cm

Find the area of the circle

• 56.52

• 254.34

• 1017.36

• 113.04

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

• 37.68mm

• 18.84mm

• 78.5mm

• none of the above

A circular swimming pool is 21 feet in diameter.
How many feet around is the pool?

• 10.5 ft

• 42 ft

• 65.94 ft

• 131.95 ft