Posted by niraj on Tuesday, August 30, 2011 at 6:33am.
not enough information, you didn't give the height of the prism.
Since the base is a right-angled triange, (9^2 + 12^2= 15^2),
the area of the base is (1/2)(9)(12) = 54 cm^2
Once you know the height h, the total surface area would be
2(54) + 9h + 12h + 15h
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