Answer:
A) H = 18 - 1 = 6
Explanation:
B) Since the fixed size of this triangle is 18, we just next to find how much space is left for h. So as the equation above states, h = 18 - 1 - 6
Simplify that to 18-7
18 - 7 = 11
h = 11
h=5
18x2 = 36
36/6 = 6
6 = h+1
Check:
5+1 = 6
6x6 = 36
36/2 = 18
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