What's the surface area of a triangular prism? I dont know which is base or whatever but the numbers are 5, 12. 17 and 13.

Answer 1

You need the sides and height of the base triangle, and the slant height.

Assuming base and height of the triangle is 5 and 12 then the base area is (5 x 12) / 2 = 30 units^2

Assuming the base triangle is isosceles triangle with the sides 5, 17 and 17 and the slant height is 13 (I'm using all your numbers).

Lateral Area = (5 x 17) / 2 + (17 x 17) /2 + (17 x 17) /2 = 331.5

Surface Area = Base Area + Lateral Area = 30 + 331.5 = 361.5 unit^2