Radius, Diameter, Circumference Review

Front

What is the definition of diameter in a circle?

Back

The diameter is the distance across a circle through its center, equal to twice the radius.

Front

How do you calculate the circumference of a circle?

Back

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

Front

If the diameter of a circle is 6 meters, what is the radius?

Back

The radius is 3 meters.

Front

What is the approximate value of π (pi)?

Back

π (pi) is approximately 3.14.

Front

What is the relationship between radius and diameter?

Back

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

Front

Find the circumference of a circle with a radius of 1.5 m.

Back

Circumference = 2 × π × 1.5 m ≈ 9.42 m.

Front

If a circle has a circumference of 25.12 yd, what is its diameter?

Back

Diameter = Circumference / π ≈ 25.12 yd / 3.14 ≈ 8 yd.

Front

What is the formula to find the radius if you know the circumference?

Back

Radius = Circumference / (2 × π).

Front

If the diameter of a circle is 12 in, what is the circumference?

Back

Circumference = π × 12 in ≈ 37.68 in.

Front

What is the circumference of a circle with a diameter of 18.84 m?

Back

Circumference = π × 18.84 m ≈ 59.24 m.