Radius and Diameter Circumference Pi

What is the radius?

• 18

• 72

• 38

• 14

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 of the circle is 56.52 meters. What is the circle's radius?

• 9 meters

• 28.26 meters

• 56.52 meters

• 18 meters

What is the diameter?

(do not find circumference)

• 8

• 16

• 10

• 4

A circular swimming pool is has a circumference of 65.94 ft. What is the diameter of the pool?

• 207.05 ft

• 42 ft

• 21 ft

• 10.5 ft

What is the circumference of a circle with a radius of 54 m?

• 339.12 m

• 169.56 m

• 84.78 m 

Find the circumference (to the nearest whole number)

• 88 in

• 44 in

• 116 square in

• None of the above

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Use π = 3.14.

• 4 in.

• 8 in.

• 12 in.

• 16 in.

Is the red line a radius or diameter of the circle?

• Radius

• Diameter

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's approximate circumference?

• 3 m 

• 9.42 m

• 12 m

• 18.84 m