H.
1) In this problem, we have to check out which one of those trios the Pythagorean Theorem doesn't work for the given measures.
F ) a² =b² +c²
5² = 3²+4² True Classic Pythagorean Triple 3,4 ,5
G) 5, 12, 13
13² = 5² +12² Another classic Pythagorean Trio for right triangle 5,12,13
169 = 25 +144 True
H) We have the following measures: hypotenuse of that triangle to be 21, 9, and 12, since the area of the square is l²=144 then l =12, writing the measurements plugging into the Pythagorean Theorem and taking 21 as the larger side (possible hypotenuse):
a²=b² +c²
21² ≠ 9² +12 ²
441 ≠ 81 +144
441 ≠ 225 FALSE
So the junction of those three sides does not yield a right triangle.
I) 10² = 8² +6² True