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) commonly used in calculations?

Back

π (pi) is approximately 3.14.

Front

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

Back

Circumference = π × diameter = 3.14 × 10 = 31.4 feet.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

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

Back

Circumference = 2 × π × radius = 2 × 3.14 × 5 = 31.4 cm.

Front

What is the distance around a circle called?

Back

Circumference.

Front

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

Back

Diameter = Circumference / π = 62.8 / 3.14 = 20 cm.

Front

What is the diameter of a circle with a circumference of 31.4 feet?

Back

Diameter = Circumference / π = 31.4 / 3.14 = 10 feet.

Front

How do you convert radius to diameter?

Back

Multiply the radius by 2.

Front

What is the circumference of a circle with a diameter of 4 inches?

Back

Circumference = π × diameter = 3.14 × 4 = 12.56 inches.