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 the diameter of a circle is 10 feet, what is the 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

If the radius of a circle is 7 cm, what is the diameter?

Back

Diameter = 2 × radius = 2 × 7 = 14 cm.

Front

How do you convert radius to circumference?

Back

Use the formula: Circumference = 2 × π × radius.

Front

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

Back

Circumference = 2 × π × 5 = 31.4 inches.

Front

If a circle has a circumference of 18.8 cm, what is its diameter?

Back

Diameter = Circumference / π = 18.8 / 3.14 = 6 cm.

Front

What is the circumference of a circle with a diameter of 14 cm?

Back

Circumference = π × diameter = 3.14 × 14 = 43.96 cm.

Front

If the diameter of a ring is 3.5 feet, what is its circumference?

Back

Circumference = π × diameter = 3.14 × 3.5 = 10.99 feet.