Circumference, Diameter, Radius

a straight line passing from side to side through the center of a body or figure, especially a circle or sphere

• Diameter

• Chord

• Secant

• Tangent

What is the radius of a circle when the diameter is 70 m?

• 38

• 35

• 90

• 140

What is the diameter?

• 8

• 16

• 10

• 4

What is the formula for circumference of a circle given the radius?

• C = π x radius

• C = 2 x π x radius

• C = π x Diameter

• C = 2 x π x Diameter

Cynthia wants to buy a round photo frame for her brother. The radius of the photo frame is 9 cm. What is the photo frame’s circumference?

• 28.26 cm

• 56.52 cm

• 4.5 cm

• 18 cm

What is the circumference of this circle?

• 3.14 cm

• 37.68 cm

• 6 cm

• 68.4 cm

Find the circumference of a circle with a diameter of 11 millimeters.

• 34.54 mm

• 5.5 mm

• 17.27 mm

• 69.08 mm

What is the circumference of a 12 inch (diameter) pizza?

• 37.68 inches

• 6 inches

• 18.84 inches

• 75.36 inches

What is the diameter of a circle when the measure of its radii is 24 m?

• 12

• 32

• 25

• 48

What is the radius?

• 18

• 72

• 38

• 14