Question 112387
1) Think about the formula for finding the area of a square whose side is S:

{{{A = S^2}}} But in this problem, you are told that the area, A, = 25 square meters, so substitute 25 for A and...
{{{25 = S^2}}} Take the square root of both sides.
{{{5 = S}}}
So the length of one side of the square is 5 meters.  The perimeter of a square is given by:
{{{P = 4S}}} and since S = 5, substitute 5 for S and...
{{{P = 4(5)}}}
{{{P = 20}}}meters.

2) The original area is:
{{{A[o] = 3^2}}}
{{{A[o] = 9}}}square centimeters.
The new area will be:
{{{A[n] = (3.2)^2}}}
{{{A[n] = 10.24}}}square centimeters.
The increase in the area will be the difference of these two:
{{{A[n] - A[o] = 10.24 - 9}}} = {{{1.24}}}square centimeters.