Radius and Diameter Quiz

Identify the radius and diameter of a circle with a diameter of 10 cm.

• Radius: 10 cm, Diameter: 20 cm

• Radius: 5 cm, Diameter: 10 cm

• Radius: 2 cm, Diameter: 4 cm

• Radius: 15 cm, Diameter: 30 cm

What is the radius of a circle with a diameter of 14 meters?

• 14 meters

• 7 meters

• 5 meters

• 10 meters

A circle has a radius of 5 inches. What is its diameter?

• 10 inches

• 15 inches

• 3 inches

• 7 inches

Find the diameter of a circle with a radius of 8 centimeters.

• 4 centimeters

• 16 centimeters

• 20 centimeters

• 12 centimeters

If the diameter of a circle is 20 units, what is its radius?

• 15 units

• 5 units

• 10 units

• 25 units

Explain the relationship between the radius and diameter of a circle.

• The diameter is three times the length of the radius.

• The diameter is half the length of the radius.

• The diameter is twice the length of the radius.

• The diameter and radius are equal in length.

How is the radius related to the diameter of a circle?

• The radius is half the length of the diameter.

• The radius is equal to the diameter

• The radius is one-third the length of the diameter

• The radius is double the length of the diameter

Why is the diameter of a circle always twice the length of its radius?

• Because the diameter is the distance across the circle passing through the center.

• Because the diameter is not related to the radius at all

• Because the diameter is the distance from the center to the edge of the circle

• Because the diameter is always smaller than the radius

What is the formula to calculate the radius from the diameter of a circle?

• radius = diameter * 2

• radius = diameter / 2

• radius = diameter - 2

• radius = diameter + 2