Answer:
h = 8
Step-by-step explanation:
First find the area of the square:
6 x 6 = 36
So, your triangle area is equal to 36, and the formula for triangle area is (1/2)bh.
36 = (1/2)bh
I would first multiply both sides by 2 to get rid of the 1/2.
72 = bh
They tell you that the base is 9.
72 = 9h
Divide both sides by 9.
h = 8