Math Quiz: Circumference of a Circle

What is the line that passes through the center of the circle and divides it into two equal parts called?

• Diameter

• Radius

• Pi

• Circumference

What is the distance around a circle known as?

• Diameter

• Pi

• Radius

• Circumference

What is the ratio of the circumference of a circle to its diameter approximately equal to?

• 3.14

• 2.71

• 1.62

• 4.29

What is the formula for the circumference of a circle using the diameter?

• C = Pi * R

• C = 2 * Pi * R

• C = Pi * D

• C = 2 * Pi * D

If a circle has a radius of 8 cm, what is its diameter?

• 4 cm

• 8 cm

• 12 cm

• 16 cm

What is the circumference of a circle with a diameter of 14 cm (Use Pi = 3.14)?

• 46.48 cm

• 44.28 cm

• 43.96 cm

• 45.12 cm

How much greater is the circumference of a circle with a diameter of 18 cm than a circle with a radius of 5 cm?

• 6.28 cm

• 9.42 cm

• 25.12 cm

• 15.70 cm

What is the distance around a circular pond with a diameter of 20 m?

• 62.80 m

• 69.60 m

• 75.40 m

• 82.20 m

How far will a car tire go in 120 turns if it has a radius of 20 cm?

• 4, 800 cm

• 15, 072 cm

• 1,788 cm

• 1,896 cm

What is the longest chord that can be drawn in a circle called?

• Diameter

• Radius

• Circumference

• Chord