Circles Perimeter and Radius

The distance around the outside of the circle

• diameter

• radius

• circumference

• area

The ratio of the Circumference to the diameter of the circle

• area

• circumference

• pi

• Mrs. McDonald

Half of the diameter is called the

• pi

• radius

• circumference

• area

The circumference is like adding up all around the circle. What is another word for adding up all around a figure?

• diameter

• perimeter

• McDonaldeter

• thermometer

Pi is approximately ______.

• 3.14

• 31.4

• .314

• 3.1.4

If the radius of a circle is 11 cm, what is the circumference?

• 22 cm

• 34.54 cm

• 69.08 cm

• 379.94 cm

If the circumference of a circle is 141.3 feet, what is the approximate radius? (use π = 3.14)

• 23 ft

• 222 ft

• 444 ft

• 887 ft

The distance around an object is called

• area

• perimeter

• length

• radius

• diameter

What does this picture show?

• diameter

• radius

• area

• perimeter

If the diameter of your bicycle wheel is 26 inches, about how far will you move with one spin of your wheels?

(1 rotation of the wheel)

• 26 inches

• 52 inches

• 82 inches

• 676 inches