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Ilya [14]
4 years ago
14

The formula for a trapezoid relates the area A, the two bases, a and b, and the height, h.

Mathematics
2 answers:
7nadin3 [17]4 years ago
7 0
First you switch sides (a+b)/2 h=A
Then  Multiply the fractions h(a+b)/2 =4
Multiply both sides by 2  2h (a+b/2 =2a
Simplfy h(a+b) = 2a 
Divide both sides by h 
simplfy
Subtract b form both sides 
your answer a=<span><span>bh</span><span><span>−h</span>+<span>2</span></span></span>
Keith_Richards [23]4 years ago
3 0

multiply both sides by 2 to get

2A = (a+b)*h

divide both sides by h

 to get 2A/h = a+b

 subtract b from both sides to get a = 2A/h -b


3rd choice is correct





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