Area of Circles

Front

What is the formula for the area of a circle?

Back

Area = π × r², where r is the radius.

Front

What is the radius of a circle?

Back

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

Front

What is the diameter of a circle?

Back

The diameter is twice the length of the radius, or the distance across the circle through its center.

Front

How do you convert diameter to radius?

Back

Radius = Diameter ÷ 2.

Front

If a circle has a radius of 7 cm, what is its area?

Back

Area = π × (7 cm)² = 153.94 cm² (approximately).

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

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

Back

Radius = 10 inches ÷ 2 = 5 inches.

Front

Calculate the area of a circle with a radius of 5.5 feet.

Back

Area = π × (5.5 feet)² = 94.985 ft² (approximately).

Front

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

Back

Area = π × (6.5 inches)² = 132.665 in² (approximately).

Front

How do you find the area of a circular window with a diameter of 15 meters?

Back

Area = π × (7.5 meters)² = 176.625 m² (approximately).