Perimeter Area and Circumference Circles

The perimeter of a circle is also known as the ______of the circle

• area

• arc

• circumference

Choose the correct formulas for the circumference of the circle.

Ratio of circumference to diameter is a constant and it is denoted as ____.

Can you say that the circumference of a circle is always more than three times its diameter?

• Yes

• No

The radius of the circle is 9 meters.  What is the circle's circumference?

• 9 meters

• 28.26 meters

• 56.52 meters

• 18 meters

Find the perimeter of the semicircle.

• 12.86cm

• 20.56cm

• 25.12cm

• 50.24cm

What is the circumference of this circle?

• 78.5 m

• 31.4 m

• 15.7 m

• 3.14 m

• 56.52

• 18

• 18.84

• 28.26 in

• 56.52

• 18

• 18.84

• 28.26 in

What is the circumference?

• 48

• 96

• 24

• 18