Area of Circles

Front

What is the diameter of a circle?

Back

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

Front

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

Back

25 yards

Front

What is the formula to calculate the area of a circle?

Back

Area = π × radius².

Front

What is the area of a circle with a radius of 5 yards?

Back

Area = π × (5)² = 78.54 square yards.

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 radius of a circle is 10 meters, what is the area?

Back

Area = π × (10)² = 314.16 square meters.

Front

What is the area of a circle with a radius of 7 meters?

Back

Area = π × (7)² = 153.94 square meters.

Front

What happens to the area of a circle if the radius is doubled?

Back

The area increases by a factor of four.

Front

What is the area of a circle with a radius of 12 meters?

Back

Area = π × (12)² = 452.39 square meters.