Area of a Circle

Front

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

Back

Area = π × r², where r is the radius of the circle.

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 is 'diameter' in a circle?

Back

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

Front

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

Back

Area = π × (7 cm)² ≈ 153.94 cm².

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

How do you find the radius if you know the area of the circle?

Back

Radius = √(Area/π).

Front

What is the area of a circle with a radius of 10 cm?

Back

Area = π × (10 cm)² ≈ 314.16 cm².

Front

What is the relationship between radius and diameter?

Back

The diameter is twice the radius (Diameter = 2 × Radius).

Front

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

Back

Area = π × (5 cm)² ≈ 78.54 cm².

Front

If a circle has an area of 314.16 cm², what is its radius?

Back

Radius = √(314.16 cm²/π) ≈ 10 cm.