Given:
Given that the base of the triangle is 4 cm.
The height of the triangle is 3 cm.
The height of the prism is 8 cm.
The other side of the triangle is 5 cm.
We need to determine the surface area of the triangular prism.
Surface area of the triangular prism:
The surface area of the triangular prism can be determined using the formula,
![SA=bh+(s_1+s_2+s_3)H](https://img.qammunity.org/2021/formulas/mathematics/high-school/g8kvvj2o6pe1prhnobzozitcf8q0dnpe8k.png)
where b is the base of the triangle,
h is the height of the triangle,
s₁, s₂, s₃ are the side lengths of the triangle and
H is the height of the prism.
Substituting b = 4, h = 3, s₁ = 4, s₂ = 3, s₃ = 5 and H = 8, we get;
![SA=(4)(3)+(4+3+5)(8)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/vn2xwnop7c4s2ol0qa54z4xtj7j03ojzbg.png)
![SA=12+(12)(8)](https://img.qammunity.org/2021/formulas/mathematics/middle-school/4p5k5mr2gbsikvdmsdj7mn7i49iozsa0he.png)
![SA=12+96](https://img.qammunity.org/2021/formulas/mathematics/middle-school/axlpaa3ac90kbxscesp83335iirdm98d3j.png)
![SA=108 \ cm^2](https://img.qammunity.org/2021/formulas/mathematics/middle-school/xq1hkah8fbmltqur6hf4ik80ep2e36uppj.png)
Thus, the surface area of the triangular prism is 108 square cm.