Area and Circumference

Front

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

Back

The radius can be found using the formula: radius = diameter / 2.

Front

What is the formula for the area of a circle?

Back

The area of a circle is calculated using the formula: Area = π * r², where r is the radius.

Front

What is the formula for the circumference of a circle?

Back

The circumference of a circle is calculated using the formula: Circumference = π * d, where d is the diameter.

Front

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

Back

The radius is 5 cm (radius = diameter / 2).

Front

What is the value of π (pi) approximately?

Back

π (pi) is approximately 3.14.

Front

How do you find the diameter of a circle if you know the circumference?

Back

Diameter can be found using the formula: Diameter = Circumference / π.

Front

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

Back

The circumference is approximately 43.96 cm (Circumference = 2 * π * r).

Front

If a circle has a radius of 4 inches, what is its area?

Back

The area is approximately 50.27 square inches (Area = π * r²).

Front

What is the relationship between diameter and radius?

Back

The diameter is twice the length of the radius (Diameter = 2 * radius).

Front

If the circumference of a circle is 31.4 cm, what is the diameter?

Back

The diameter is 10 cm (Diameter = Circumference / π).