Surface area of a triangular prism
Consider the cardboard packaging box, which has two congruent triangular ends
Each end is a right-angled triangle. The right angle is between sides \(a\) and \(b\)
Side \(a\) of each triangular end is 9 cm
Side \(b\) of each triangular end is 12 cm
Side \(c\) of each triangular end is 15 cm
The prism length is 33 cm
Both triangular ends and all three rectangular side faces are included. Each rectangular face has the prism length and one side of the triangular end