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(h + 32)² =h² +1600
h² + 64h +32×32 =h² +1600
64h =1600- 32×32
8h =200 - 128
8h =72
h =9 cm
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40^2+h^2=(h+32)^2
1600=64h+32^2
1600-(40-8)^2=64h
640-64=64h
10-1=h =>h=9
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