Radius and Diameter Circumference Formulas

Find Circumference.

• 87.92 cm

• 43.96 cm

• 21.98 cm

• 3.14 cm

What is line CB called?

• Circumference

• Diameter

• Radius

• Chord

What is line AD called?

• Area

• Circumference

• Radius

• Diameter

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. Watch the units.

• 37.68 m²

• 37.68 m

• 18.84 m

• 18.84 m²

Find Circumference. Round to the nearest hundredths.

• 40.69 yd

• 5.65 yd

• 11.30 yd

• 22.61 yd

Find Circumference. Round to nearest hundredths

• 14.13 km

• 56.52 km

• 28.26 km

• 63.59 km

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

• 36π

• 9π

• 4.5π

• 18π

What is a straight line that goes through the center of a circle from side to opposite side?

• Diameter

• Circumference

• Radius

• Center

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

• Diameter

• Circumference

• Chord

• Radius