The square shown is divided into 4 congruent rectangles. If the perimeter of the square is 144 units, what is the perimeter of one of the four congruent rectangles?
If the PERIMETER Of the square is 144 each side is 144/4 = 36 units
then each SHORT side of the rectangles is 36/4 = 9
the LONG side of each rectangle is 36 also
so perimeter = 36 + 9 + 36 + 9 = 90 units