Circles Review

Match each word to its definition.

• The distance around a circle.

• Area

• Distance across a circle

• Circumference

• Center to edge of the circle

• Radius

• Space inside a circle

• Diameter

Drag the labels to show which circle shows a radius and which circle shows a diameter.

a

b

Radius

Diameter

The diameter of this circle is:

Mathematical Equivalence

ON

The area of this circle is (use 3.14 to approximate for pi. Do not round your answer.)

Mathematical Equivalence

OFF

The exact area of this circle in terms of pi is:

Mathematical Equivalence

OFF

The exact circumference of this circle in terms of pi is:

Mathematical Equivalence

OFF

The approximate circumference of this circle is (use 3.14 for pi):

Mathematical Equivalence

OFF

Pair the radius to its diameter.

• Radius of 3.39

• Radius of 2.5

• Diameter of 7.1

• Diameter of 6.78

• Diameter of 5

• Radius of 3.55

A circle has an area of 706.5 square feet. What is it's radius?

Mathematical Equivalence

ON

Match each statement to what you would need to find.

• area

• The distance you travel on a ferris wheel

• circumference

• the amount of whipped cream to cover a pie.

• radius

• the length of one spoke on a bicycle wheel.