You can
put this solution on YOUR website!You are right to say,
, where pi is approximately 3.14 or also approximately
. I checked out the problem and because the area is given as 154 square centimeters, they used
as the approximation for pi.
To solve for
, you can divide both sides by
. Since this will get ugly looking, you might want instead to MULTIPLY both sides of the equation by the reciprocal of
, which is
.
It looks like this:
Amazingly enough, the 22 in the denominator on the left side of the equation just happens to divide evenly into 154, and it goes 7 times. So you will have
So if
, then
r= 7 or r= -7. The radius cannot be negative, so r= 7 centimeters.
R^2 at SCC
