radius, diameter, Circumference

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

• 3 ft

• 4 ft

• 5 ft

• 6 ft

What is the value of π (pi)?

• 2.71

• 3.14

• 3.33

• 4.00

What is the circumference of a circle with a radius of 5 cm?

• 20 cm

• 25 cm

• 31.4 cm

• 15 cm

If a circle has a radius of 4 inches, what is its circumference?

• 12.56 in

• 25.12 in

• 16 in

• 20 in

What is the relationship between radius and diameter?

• The diameter is always twice the length of the radius.

• The radius is always twice the length of the diameter.

• The diameter is equal to the radius.

• The radius and diameter are the same length.

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

• Circumference = 2 × π × radius

• Circumference = π × diameter

• Circumference = 2 × diameter

• Circumference = π × radius²

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.

• The area of the circle divided by pi.

If a circular garden has a diameter of 8 m, what is the radius?

• 2 m

• 3 m

• 4 m

• 5 m

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 radius multiplied by two.

• The area of the circle divided by pi.

How do you calculate the circumference of a circle?

• Circumference = 2 × π × radius

• Circumference = π × diameter

• Circumference = 2 × radius

• Circumference = radius × height