Radius, Diameter, Circumference Review

Front

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

Back

Circumference = π × Diameter or Circumference = 2 × π × Radius.

Front

If the radius of a circle is 5 cm, what is the diameter?

Back

Diameter = 2 × Radius = 2 × 5 cm = 10 cm.

Front

What is the relationship between radius and diameter?

Back

Diameter is twice the length of the radius.

Front

Find the circumference of a circle with a radius of 10 cm.

Back

Circumference = 2 × π × 10 cm ≈ 62.83 cm.

Front

What does the term 'circumference' refer to?

Back

Circumference is the distance around the circle.

Front

If a circle has a diameter of 8 m, what is its radius?

Back

Radius = Diameter / 2 = 8 m / 2 = 4 m.

Front

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

Back

Circumference = π × 14 m ≈ 43.98 m.

Front

Which segment represents the radius in a circle?

Back

The radius is the segment from the center of the circle to any point on the circle.

Front

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

Back

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

Front

What is the formula to find the diameter if the radius is known?

Back

Diameter = 2 × Radius.