Area of a Circle

Front

What is the formula for the area of a circle?

Back

A = πr²

Front

What does 'r' represent in the area formula A = πr²?

Back

The radius of the circle.

Front

What is the value of π (pi) used in calculations?

Back

Approximately 3.14.

Front

If a circle has a radius of 5 cm, what is its area?

Back

A = π(5)² = 78.5 cm².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

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

Back

Radius = 10 m / 2 = 5 m.

Front

How do you calculate the area of a circle if you know the diameter?

Back

First, find the radius (Diameter / 2), then use A = πr².

Front

What is the area of a circle with a radius of 7 m?

Back

A = π(7)² ≈ 153.86 m².

Front

What is the area of a circle with a diameter of 12 inches?

Back

A = π(6)² ≈ 113.04 in².

Front

What is the area of a circle with a radius of 3.5 m?

Back

A = π(3.5)² ≈ 38.48 m².