Volume of Triangular prism = 1/3×h×are of base of prism
⇒Area of base of prism will be 84.
Volume = 1/3×h×base of prism
= 1/3×32×84
= 32×28
= 896
Volume of prism is 896.
I hope it will help u. And area of base is area of given triangular sides.
it is not a pyramid. u wrote formula for that. pls correct.
Sir delete it I'll do it again. Now I'm not able to correct it.

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The base of the prism is a triangle of sides 13, 14, and 15.
Area of the base of the prism is found by Heron's formula:
  semi perimeter = s = (a+b+c)/2 = 21
Area = \sqrt{s(s-a)(s-b)(s-c)}=\sqrt{21*8*7*6}=4*7*3 =84\ square\ units\\\\Volume\ of\ regular\ triangular\ prism=base\ area*height\\=84*32=2,688 cubic units

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