Circumference of a Circle

Front

What is the radius of a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What is the diameter of a circle?

Back

The diameter is twice the length of the radius and is the distance across the circle through its center.

Front

How do you calculate the circumference of a circle?

Back

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

Front

What is the value of π (pi)?

Back

π (pi) is approximately 3.14 or 22/7.

Front

If the radius of a circle is 5 ft, what is the circumference?

Back

Circumference = 2 × π × 5 ft = 31.4 ft.

Front

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

Back

Circumference = π × 10 m ≈ 31.4 m.

Front

What is the relationship between radius and diameter?

Back

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

Front

What is the circumference of a circle with a radius of 7 cm?

Back

Circumference = 2 × π × 7 cm ≈ 43.96 cm.

Front

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

Back

Circumference = π × 12 inches ≈ 37.68 inches.

Front

If a circle has a circumference of 62.8 ft, what is its radius?

Back

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