Question

The radius of this ball is 9 millimeters. Which equation gives the ball's surface area, in square millimeters?

Answer 1

Explanation:

SA= 4
`\pi`r²

=4
`\pi`9²

=324
`\pi` m² or 1017.88 m²

Answer 2

Explanation:

the equality is: 4 × π × r × r

so the answer is

4 • π • 81

= 324π