Question 1075802
If the width is x, then 2x+2*length=28
2*length=28-2x
length=14-x
So:
x²+(14-x)²=12²=144
x²+x²-28x+196-144=0
2x²-28x+52=0
x²-14x+26=0
x²-14x+49=49-26
(x-7)²=23
x-7=+/-√23
x=7+/-√23=11.796 or 2.204 ☺☺☺☺