Area of a Circle

Front

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

Back

A = π * r²

Front

If the radius of a circle is 4.5 feet, what is the area?

Back

63.585 ft²

Front

What is the diameter of a circle if the radius is 3.5 feet?

Back

7 feet

Front

What is the radius of a circle if the diameter is 18 feet?

Back

9 feet

Front

If the diameter of a circle is 50 yards, what is the radius?

Back

25 yards

Front

What does 'radius' mean in relation to a circle?

Back

The radius is the distance from the center of the circle to any point on its circumference.

Front

What does 'diameter' mean in relation to a circle?

Back

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

Front

How do you calculate the diameter from the radius?

Back

Diameter = 2 * radius

Front

How do you calculate the radius from the diameter?

Back

Radius = diameter / 2

Front

What is the approximate value of π (pi)?

Back

π ≈ 3.14