The total surface area of a triangular prism is given by the formula:

Here's how to find the surface area of the triangular prism.

The total surface area of a triangular prism is given by the formula:

$$\text{Total Surface Area} = 2 \times (\text{Area of triangular base}) + (\text{Perimeter of triangular base} \times \text{Length of prism})$$

From the image, we have the following dimensions for the triangular base:

• Base ($B$) = 35 units
• Height ($H$) = 28 units
• One slanted side ($S$) = 33 units The length of the prism ($L$) = 25 units.

We will assume the triangular base is an isosceles triangle, meaning the two slanted sides are equal. So,