The answer is 70cm.
Step 1). If the total area is 150cm2 then each square is 25cm2. I found that out by doing 150(total area) divided by 6(number of congruent squares).
Step 2) If the area of one square is 25 its side length is 5. I found that out by square rooting 25 because the are of a square base times height and if the square is congruent it means the base and height are the same.
Step 3) count the sides of the square that make up the perimeter of the shape. I found the answer by doing 5 times 14 which gives you 70 and that is the answer
