Area of a Circle

Front

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

Back

Area = π × r², where r is the radius.

Front

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

Back

Area = π × (5 cm)² = 78.54 cm².

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius.

Front

If the diameter of a circle is 20 yards, what is the radius?

Back

Radius = Diameter ÷ 2 = 10 yards.

Front

What is π (pi)?

Back

π (pi) is a mathematical constant approximately equal to 3.14.

Front

How do you convert diameter to radius?

Back

Divide the diameter by 2.

Front

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

Back

Area = π × (7 cm)² = 153.94 cm².

Front

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

Back

The area increases by a factor of 4.

Front

What is the area of a circle with a radius of 3 cm?

Back

Area = π × (3 cm)² = 28.27 cm².

Front

What is the diameter of a circle with a radius of 12 inches?

Back

Diameter = 2 × Radius = 24 inches.