1. Identify the faces:
A triangular prism has two triangular bases (identical shapes) and three rectangular lateral faces.
2. Area of the triangular bases:

You'll need the area of each triangular base. The formula for the area of a triangle is: Area = 1/2 * base * height

Where:

base is the length of any side of the triangle.

height is the perpendicular distance from the base to the opposite vertex (corner) of the triangle.
3. Area of the rectangular lateral faces:
4. Total surface area:
Once you have the areas of the two triangular bases and the three rectangular faces, simply add all the areas together to find the total surface area.
Formula:
Total Surface Area = 2 * Area of Triangle Base + Area of Rectangle 1 + Area of Rectangle 2 + Area of Rectangle 3
Here are some additional points to consider:

If the triangular base is equilateral or isosceles, you might be able to calculate the height using the triangle's side lengths and basic trigonometry.

In some cases, the three rectangular faces might have the same dimensions if the prism is standing perfectly upright.
By following these steps and considering the specific dimensions of your triangular prism, you can calculate its total surface area.