Circumference and Area

Front

What is the definition of circumference?

Back

The measurement around the circle.

Front

What is the formula for calculating the circumference of a circle?

Back

Circumference = 2 × π × radius or Circumference = π × diameter.

Front

What is the definition of radius?

Back

The distance from the center of the circle to any point on its edge.

Front

What is the definition of diameter?

Back

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

Front

How do you calculate the area of a circle?

Back

Area = π × radius².

Front

What is the approximate value of π (pi)?

Back

Approximately 3.14.

Front

If the radius of a circle is 7 cm, what is its area?

Back

Area = π × (7 cm)² = 153.86 cm².

Front

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

Back

Radius = diameter ÷ 2 = 10 m ÷ 2 = 5 m.

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × radius.

Front

What is the area of a circle with a radius of 5 m?

Back

Area = π × (5 m)² = 78.5 m².