Circumference of Circles

Circumference of Circles

​

Multiple Select

How are the radius and diameter related?

Check all that apply

• The radius is half the diameter.

• The diameter is two times the radius.

• d = 2r

• r = d/2

Multiple Choice

The radius of a circle is 20in, what is the diameter?

• 10in

• 40in

• 31.4in

• 125.6in

Multiple Choice

The diameter of a circle is 14ft. What is the radius?

• 21.98 ft

• 7 ft

• 43.96 ft

• 14 ft

Multiple Choice

Find the circumference of the the circular pool.

• 14ft

• 7ft

• 43.96ft

• 21.98ft

Multiple Choice

Find the circumference of the circle.

• 12ft

• 24ft

• 37.68ft

• 75.36ft

Multiple Choice

Bonus!

The Circumference of a circle is 28.26m. What is the diameter of the circle.

• 14.13m

• 9m

• 18m

• 28.26m

Multiple Choice

Find the perimeter of this semicircle.

• 21.98cm

• 17.99cm

• 28.96cm

• 10.99cm