Area of a Circle

Front

What is the formula for the area of a circle?

Back

Area = πr², where r is the radius of the circle.

Front

What is the value of π (pi) approximately?

Back

π is approximately 3.14.

Front

If the radius of a circle is 5 cm, what is its area?

Back

Area = π(5)² = 78.5 cm².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

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

Back

Radius = Diameter / 2 = 5 cm.

Front

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

Back

Area = π(7)² ≈ 153.94 cm².

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.

Front

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

Back

Area = π(4)² ≈ 50.27 cm².

Front

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

Back

Radius = √(Area/π) ≈ 10 cm.

Front

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

Back

Area = π(10)² ≈ 314.16 cm².