Parts of a Circle and Circumference Review

Front

What is the diameter of a circle?

Back

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

Front

If the radius of a circle is 9 cm, what is the diameter?

Back

The diameter is 18 cm (Diameter = 2 x Radius).

Front

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

Back

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

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

If the diameter of a circle is 10 in, what is the radius?

Back

The radius is 5 in (Radius = Diameter / 2).

Front

What is the relationship between diameter and radius?

Back

The diameter is always twice the length of the radius.

Front

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

Back

The diameter is 10 cm (Diameter = Circumference / π).

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

If the radius of a circle is 4 cm, what is the circumference?

Back

The circumference is approximately 25.12 cm (Circumference = 2 x π x 4).

Front

What is a chord in a circle?

Back

A chord is a line segment whose endpoints lie on the circle.