Circles Spiral Review

Front

What is the diameter of 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 radius of a circle is 7 cm, what is the diameter?

Back

The diameter is 14 cm (diameter = 2 × radius).

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius.

Front

How do you find the area of a circle?

Back

Area = π × radius².

Front

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

Back

Circumference = π × 10 cm ≈ 31.42 cm.

Front

If a bicycle wheel has a diameter of 70 cm, how far does it travel in one revolution?

Back

It travels approximately 220 cm (Circumference = π × 70 cm).

Front

What is the radius of a circle with a circumference of 31.42 cm?

Back

The radius is 5 cm (Circumference = 2 × π × radius).

Front

What is a chord in a circle?

Back

A chord is a line segment with both endpoints on the circle.

Front

What is a sector of a circle?

Back

A sector is a region enclosed by two radii and the arc between them.