Radius/Diameter

The radius is the

• distance around the circle

• distance from the center to an edge of a circle

• distance across the circle through the center

• center of the circle

The diameter is the

• distance around the circle

• center of the circle

• distance from the center to an edge of a circle

• distance across the circle that runs through the center

Determine the radius of the penny

• 59.66 mm
• 9.5 mm
• 38 mm
• 119.32 mm

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

What number is pi?

• 1.41

• 2.00

• 3.14

• 5.14

A bicycle tire has a diameter of 27 inches. What is the radius?

• 27π
• 13.5
• 81
• 25π

Find the radius of a circle who's diameter is 40 ft.

• 40ft
• 80ft
• 20ft
• 45ft

What is the radius of a circle when the diameter is 70 m?

• 38

• 35

• 90

• 140

What is the diameter of a circle when radius is 24 m?

• 12

• 32

• 25

• 48

Is this radius or diameter?

• Radius

• Diameter