Answer:
81 = 1/ 2h(9)
Step-by-step explanation:
A= 1/2h(B + b)
A= 81
B= 2
b= 7
81= 1/2h (2+7)
1/ 2 x h (2 + 7)
1/ 2x h(9)
Answer 81 = 1/ 2h(9)
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