Finding Circumference

Front

What is the formula to find 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 (pi) is approximately 3.14.

Front

If a circle has a radius of 7 feet, what is its circumference?

Back

Circumference = 2 × π × 7 ≈ 43.96 feet.

Front

What does circumference measure?

Back

Circumference measures the distance around a circle.

Front

If the diameter of a circle is 10 inches, what is the circumference?

Back

Circumference = π × 10 ≈ 31.4 inches.

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (Diameter = 2 × radius).

Front

How do you convert diameter to radius?

Back

Radius = Diameter ÷ 2.

Front

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

Back

Circumference = π × 12 ≈ 37.68 cm.

Front

If a bicycle tire has a diameter of 27 inches, what is its circumference?

Back

Circumference = π × 27 ≈ 84.82 inches.

Front

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

Back

Circumference = 2 × π × 5 ≈ 31.4 meters.