You do do pi r squared times 2 + pi times height and diameter

Sa=2 pie r

pie=3.14

r=the number of the radius

pie=3.14

r=the number of the radius

The area of a circle is simply PI x R squared,

Where PI is the value 22/7 and R is the radius of the circle.

Hence the surface area of a circle measuring 30 cm in diameter would be 22/7 x 15 x 15 = 707.14 cm2

Where PI is the value 22/7 and R is the radius of the circle.

Hence the surface area of a circle measuring 30 cm in diameter would be 22/7 x 15 x 15 = 707.14 cm2

A=2*pi*r

pi=3.14

So,2*3.14*r

r=7

=43.96=44.00

pi=3.14

So,2*3.14*r

r=7

=43.96=44.00

Multiply the radius by itself and then multiply that result by pi. That gives the area of the circle.