Area and Circumference Practice

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

What is circumference?

Back

The circumference is the distance around a circle.

Front

What is the formula for the circumference of a circle?

Back

Circumference = π × diameter or Circumference = 2 × π × 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

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

If the diameter of a circle is 16 cm, what is the radius?

Back

The radius is 8 cm.

Front

Calculate the area of a circle with a radius of 5 cm.

Back

Area = π × (5 cm)² = 78.54 cm².

Front

What is the relationship between diameter and radius?

Back

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

Front

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

Back

Diameter = Circumference / π = 10 cm.

Front

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

Back

Area = π × (5 cm)² = 78.54 cm².