Area of Circles

Front

What is the formula for finding the area of a circle?

Back

A = π·r²

Front

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

Back

Approximately 3.14

Front

What is the radius of a circle?

Back

The distance from the center to any point on the circle.

Front

If a circle has a diameter of 28 feet, what is its radius?

Back

14 feet

Front

How do you calculate the area of a circle with a radius of 7 feet?

Back

A = π·(7)² = 153.86 square feet (using π ≈ 3.14).

Front

What is the area of a circle with a radius of 10 inches?

Back

A = π·(10)² = 314 square inches (using π ≈ 3.14).

Front

If the area of a circle is 50.27 square feet, what is its radius?

Back

Radius is approximately 4.00 feet (using A = π·r²).

Front

What is the diameter of a circle if the radius is 5 cm?

Back

Diameter = 2 × radius = 10 cm.

Front

How do you find the area of a circle with a diameter of 20 cm?

Back

First, find the radius (10 cm), then use A = π·(10)² = 314 square cm.

Front

What is the area of a pizza with a diameter of 13 inches?

Back

A = π·(6.5)² = 132.665 square inches (using π ≈ 3.14).