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( 13^2 - ( (18 - 8) / 2 )^2 )^0.5*( (18 + 8) / 2 )*h = 1560
( 13^2 - ( (18 - 8) / 2 )^2 )^0.5*( (18 + 8) / 2 )*h = 1560
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