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

Back

Diameter = 2 × radius = 20 ft.

Front

What is the relationship between diameter and radius?

Back

Diameter is twice the radius.

Front

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

Back

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

Front

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

Back

Circumference = π × diameter = 3.14 × 14 = 43.98 cm.

Front

What is the radius of a circle with a circumference of 31.4 cm?

Back

Radius = Circumference / (2 × π) = 31.4 / (2 × 3.14) = 5 cm.

Front

If a circle has a circumference of 48 cm, what is its diameter?

Back

Diameter = Circumference / π = 48 / 3.14 ≈ 15.29 cm.

Front

What is the circumference of a circle with a radius of 18 cm?

Back

Circumference = 2 × π × radius = 2 × 3.14 × 18 ≈ 113.04 cm.

Front

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

Back

Diameter = 2 × radius = 2 × 14 = 28 cm.