Surface area of a trangular prism with height of 15 a side with 9 and side with 12

A tip for doing these question, you should draw the shape out and label the sides, then calculate each side.

TSA (Total Surface Area) = 2 (1/2*9*12) + 2 (15*12) + 9*15

= 108 + 360 + 135

=603

Remember to add your units!