How do you find the total surface area of tetrahedron?

To find the total surface area of a tetrahedron, you need to calculate the area of each of its four triangular faces and then sum these areas. The area of a triangle can be found using the formula ( \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} ) or using Heron's formula if the side lengths are known. Once you have the areas of all four faces, add them together to obtain the total surface area of the tetrahedron.