Circumference of a Circle

Front

What is the formula to calculate the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × radius.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

If a circle has a diameter of 10 feet, what is its circumference?

Back

Circumference = π × 10 ft ≈ 31.4 ft.

Front

What is the relationship between diameter and radius in a circle?

Back

The radius is half of the diameter.

Front

How do you find the diameter if you know the circumference?

Back

Diameter = Circumference / π.

Front

What is the circumference of a circle with a radius of 7 inches?

Back

Circumference = 2 × π × 7 in ≈ 43.96 in.

Front

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

Back

Diameter = Circumference / π ≈ 20 cm.

Front

What is the circumference of a circle with a diameter of 12 meters?

Back

Circumference = π × 12 m ≈ 37.68 m.

Front

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

Back

Circumference = 2 × π × 5 cm ≈ 31.4 cm.

Front

If a circular track has a circumference of 400 meters, what is its diameter?

Back

Diameter = Circumference / π ≈ 127.32 m.