Understanding Circles: Radius and Diameter Quiz

What is the radius of a circle?

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

• The diameter of the circle divided by two.

• The length of the circle's circumference divided by pi.

• The distance around the circle measured in degrees.

What is the diameter of a circle?

• The distance across the circle through its center, equal to twice the radius.

• The distance around the circle.

• The length of the longest chord in the circle.

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

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

• 2 meters

• 4 meters

• 6 meters

• 8 meters

If a circle has a radius of 12 cm, what is its diameter?

• 20 cm

• 22 cm

• 24 cm

• 26 cm

If the diameter of a circle is 10 cm, what is its radius?

• 2 cm

• 5 cm

• 7 cm

• 10 cm

A circular pond has a radius of 9 meters. What is the diameter of the pond?

• 12 meters

• 15 meters

• 18 meters

• 20 meters

What is π (pi)?

• A mathematical constant approximately equal to 3.14

• A type of geometric shape

• The diameter of a circle

• A formula for calculating area

The radius of a circle is 7 meters. What is the diameter?

• 10 meters

• 12 meters

• 14 meters

• 16 meters

How do you calculate the diameter from the radius?

• Multiply the radius by 2.

• Add 2 to the radius.

• Divide the radius by 2.

• Square the radius.

How do you calculate the radius from the diameter?

• Multiply the diameter by 2.

• Subtract 2 from the diameter.

• Divide the diameter by 2.

• Add 2 to the diameter.