Posted by niraj on .
The base of a solid right prism is a triangle whose sides are 9cm,12cm and 15 cm.the total surface area of the prism.

arithmetic 
Reiny,
not enough information, you didn't give the height of the prism.
Since the base is a rightangled 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