Tracy made 4 stacks of wooden blocks. The first stack was 6 blocks tall. The second stack was 5 blocks taller than the first. The third stack was 4 blocks shorter than the second stack, and the last
stack was 3 blocks taller than the third stack. How many blocks did Tracy use in all?

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.

cause it equals more

to find the perimeter, you add up all the lengths of the sides. in this case you would have to add up 18+22+40+80 which equals 160.