Circle Area

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 does the term 'radius' refer to in a circle?

Back

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

Front

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

Back

Area = π × (5)² = 25π ≈ 78.54 ft².

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

How do you calculate the diameter of a circle?

Back

Diameter = 2 × radius.

Front

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

Back

Radius = Diameter / 2 = 10 / 2 = 5 feet.

Front

What is the area of a circle with a radius of 3 inches?

Back

Area = π × (3)² = 9π ≈ 28.27 in².

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the length of the radius.

Front

If the area of a circle is 50π square units, what is the radius?

Back

Radius = √(Area/π) = √(50) ≈ 7.07 units.

Front

What is the circumference of a circle?

Back

Circumference = 2π × radius.