Area of a Circle

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius of the circle.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

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

Back

Area = π × (5)² = 78.5 ft².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

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

Back

Radius = Diameter / 2 = 5 feet.

Front

How do you convert diameter to area?

Back

First, find the radius (Diameter / 2), then use the area formula: Area = π × r².

Front

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

Back

Area = π × (7)² ≈ 153.86 ft².

Front

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

Back

Radius = 12 / 2 = 6 feet; Area = π × (6)² ≈ 113.1 ft².

Front

What is the area of a circle with a radius of 4.5 feet?

Back

Area = π × (4.5)² ≈ 63.585 ft².

Front

If the area of a circle is 314.16 ft², what is its radius?

Back

Radius = √(Area / π) ≈ 10 feet.