Circumference Practice

Front

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

Back

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

Front

If the diameter of a circle is 14 cm, what is the radius?

Back

Radius = diameter / 2 = 14 cm / 2 = 7 cm.

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

How do you find the circumference of a circle with a radius of 12.5 mm?

Back

Circumference = 2 × π × radius = 2 × 3.14 × 12.5 mm = 78.5 mm.

Front

What is the circumference of a circle with a diameter of 10 cm?

Back

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

Front

What is the relationship between diameter and radius?

Back

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

Front

If a circle has a circumference of 31.4 cm, what is its diameter?

Back

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

Front

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

Back

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

Front

What is the radius of a circle if its circumference is 62.8 cm?

Back

Radius = Circumference / (2 × π) = 62.8 cm / (2 × 3.14) = 10 cm.

Front

What is the diameter of a circle with a radius of 3 cm?

Back

Diameter = 2 × Radius = 2 × 3 cm = 6 cm.