Radius Circumference and Diameter

What number represents π?

• 31.4

• 4.13

• 3.14

• 34.1

Name the part of the circle pointed by the arrow.

• Radius

• Diameter

• Circumference

• Arc

Find the diameter of a circle if its radius is 7.5 meters. (Type the answer including the units)

Find the diameter of a circle if its radius is 8.42 inches. (Type the answer including the units)

Find the radius of a circle if its diameter is 15.9 centimeters. (Type the answer including the units)

Find the radius of a circle if its diameter is 12.8 feet. (Type the answer including the units)

Find the circumference of a circle with a radius of 13.5 mm.

• 37.68mm

• 18.84mm

• 84.78 mm

• none of the above

What is the radius?

• 18

• 72

• 38

• 14