Area of Circles

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 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 radius and is the distance across the circle through its center.

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

How do you convert diameter to radius?

Back

Radius = Diameter ÷ 2.

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14, used in calculations involving circles.

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 3 feet.

Back

Area = π × (3 ft)² = 28.27 ft² (approximately).

Front

What is the area of a circle with a diameter of 8 meters?

Back

Area = π × (4 m)² = 50.27 m² (approximately).

Front

If the radius of a circle is doubled, how does the area change?

Back

The area increases by a factor of four.