Parts of a Circle Diameter and Radius

Find Circumference. Leave answer in terms of pi (π).

• 36π

• 9π

• 4.5π

• 18π

What is the line that goes from the center of a circle to any point on the circle?

• Diameter

• Circumference

• Chord

• Radius

In words, describe this formula

• The area of a circle is equal to pi times the radius squared

• The circumference of a circle is equal to the pi times the diameter.

• The circumference of a circle is equal to pi times the radius squared

• The area of a circle is equal to pi times the diameter

Find Circumference. Round to the nearest hundredths.

• 40.69 yd

• 5.65 yd

• 11.30 yd

• 22.61 yd

Find Circumference.

• 87.92 cm

• 43.96 cm

• 21.98 cm

• 3.14 cm

Find Circumference. Leave answer in terms of pi (π)

• 36π

• 12π

• 6π

• 24π

• Name the circle: Circle B
• Name the circle: Circle DE
• Name the circle: Circle A
• Name the circle: Circle DBC

What is the radius of this circle?

• 18

• 36

• 9

• 8

What is the diameter of this circle?

• 5 in

• 10 in

• 3.14 in

• 2.5

What is the distance around a circle called?

• the radius

• the diameter

• the circumference