Medium
A square is divided into two rectangles. Perimeter of the square is 50 centimeters. What is the sum of the perimeters of the two rectangles? (in centimeters)
Explanation
Explanation
If the square has side s, then 4s=50 so s=12.5. Whichever way the square is split into two rectangles by a straight cut, the sum of their perimeters always equals 6s (the extra cut line is counted twice). So the sum = 6 x 12.5 = 75.
PRO TIP
Re-check your working by substituting the answer back into the original question.