Circumference of a Circle

In words, describe the relationship between circumference and diameter.

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

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

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

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

If a circle has a circumference of 62.8 cm, what is its diameter?

• 15 cm

• 18 cm

• 20 cm

• 25 cm

What is the relationship between diameter and radius?

• Diameter = radius

• Diameter = 2 × radius

• Diameter = radius × 3

• Diameter = radius ÷ 2

What is the definition of circumference?

• The distance around the circle.

• The area of a circle.

• The diameter of a circle.

• The radius of a circle.

What is the diameter of a circle with a radius of 3 inches?

• 4 inches

• 5 inches

• 6 inches

• 7 inches

What is the formula for the circumference of a circle?

• Circumference = π × diameter.

• Circumference = 2 × π × radius.

• Circumference = π × radius².

• Circumference = 2 × diameter.

If the radius of a circle is 7 cm, what is the diameter?

• 10 cm

• 12 cm

• 14 cm

• 16 cm

What is the circumference of a circle with a diameter of 10 ft?

• 25.0 ft

• 31.4 ft

• 35.0 ft

• 20.0 ft

What is the value of π (pi) approximately?

• 2.71

• 3.14

• 3.33

• 3.50

What does the term 'radius' refer to in a circle?

• The distance from the center of the circle to any point on its edge.

• The diameter of the circle.

• The area enclosed by the circle.

• The circumference of the circle.