William W. answered • 02/10/21
Tutor
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Math and science made easy - learn from a retired engineer
Since these are squares, the length of each side is 1/4 the total. So let's list the lengths of 1 side instead of the perimeter:
A. 3, 4, 5
B. 5, 4, 6
C. 10, 20, 30
D, 4, 6, 7
Now, realize that the lengths of each of the sides is also the lengths of the right triangle's sides. Using the Pythagorean, you can see which combination works. a2 + b2 = c2
Try them out. If it turns out to be a true statement, then that combination is possible.
