Radius and Diameter of Circle

If the diameter is 8 cm, the radius is what?

• 16 cm

• 8 cm

• 4 cm

• 2 cm

If the diameter is 2 inches, what is the radius?

• 1 inch

• 2 inches

• 3 inches

• 4 inches

If the radius is 50miles, the diameter is what?

• 25 miles

• 50 miles

• 100 miles

• 200 miles

If the radius is 2 inches, the diameter is what?

• 1 inch

• 2 inches

• 4 inches

• 8 inches

If the radius is 2.5 yards, the diameter is what?

• 1.25 yards

• 2.5 yards

• 5 yards

• 10 yards

If my radius is 10ft, what is my diameter?

• 20ft

• 5ft

• 31.4ft

• 62.8ft

What is the circumference of a circle with a diameter of 9?

• 81pi

• 9pi

• 3pi

• 6pi

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 is the diameter of this circle?

• 3.5

• 3

• 5

• 7

If the diameter of a circle is 10 mm, the circumference is approximately ___

• 314 mm

• 3.14 mm

• 31.4 mm

• 20 mm