<PRE><B>Question 927321</B>
h = sqrt( aa + bb )
12 = sqrt( 9*9 + bb )
12^2 = sqrt( 9*9 + bb )^2
144 = 81 + bb
bb = 144 - 81
b = sqrt( 144 - 81 )
b = 7.9372539332 cm
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