Circle - Area and Circumference

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 does π (pi) equal?

Back

π (pi) is approximately equal to 3.14.

Front

How do you find the diameter of a circle if you know the circumference?

Back

The diameter can be found using the formula: Diameter = Circumference / π.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2 × π × radius.

Front

What is the formula for the area of a circle?

Back

Area = π × radius².

Front

If a circle has a radius of 6 cm, what is its area?

Back

Area = π × (6 cm)² = 113.04 cm² (using π ≈ 3.14).

Front

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

Back

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

Front

What is the circumference of a circle with a radius of 12 cm?

Back

Circumference = 2 × π × 12 cm ≈ 75.4 cm.

Front

What is the space inside a circle called?

Back

The space inside a circle is called the area.

Front

What is the distance around a circle called?

Back

The distance around a circle is called the circumference.