Surface area of a circle

Answer 1

Surface area for a circle can be calculated using the following formula: A = π * r^2

Where:

A = surface area

r = radius

π = the constant pi (which is approximately 3.14)

For example, if the radius of a circle is 5cm, then you would simply input this value into the formula:

A = π * r^2

A = π * 5^2

A = 25 π

A = 25*3.14 = 78.5 cm^2

Answer 2

pi*r^2 where r is the radius.