Question

Which is the exact area of the circle?
(PICTURE IS IN THE COMMENTS)

1. 81 sp ft
2. 81 (pi) sp ft
3. 81(pi)^2 sp ft
4. 81^2(pi) ^2 sp ft

Answer 1

the area of a circle is
\[A_{\text{circle}}=\pi r^2\]
where \(r\) is the radius

Answer 2

pir^2=pi*9*9
=81pi