What does pi r squared equal?

Answer 1

It means the radius of a circle multiplied by itself, times pi.

It gives you the area of a circle.

Say the radius was 5.

5 squared, or 5x5 = 25.

25x3.14 (pi rounded to 2 decimal places because it goes on so long, 3.14159.....)

=78.5

Answer 2

The area of a circle.

Algebraically it is written as

A = pi*r^(2)

The circumference of a circle is

C = 2pir or C = pi*d

Where 'd' = 2r'.