Surface Area of a Triangular Prism Help

This calculator uses the following formulas:

SA = B * H_t + (S₁+S₂+S₃) * H

• SA = Surface Area
• B = Triangle Base
• H_t = Triangle Height
• S₁ = Triangle Side Length 1
• S₂ = Triangle Side Length 2
• S₃ = Triangle Side Length 3
• H = Height of prism