What is the total area formula for a prism?

A prism doesn't have an area; since a prism is a 3-dimensional (i.e. solid) object it has a volume. Perhaps you meant surface area. In mathematics a prism has a rather general definition. The two end faces are polygons ( not necessarily triangles ), lying in faces parallel to each other but not necessarily exactly opposite each other, and the side faces are not necessarily rectangles, but more generally parallograms. To find the total surface area you will need to find the area of each face, then sum them. In case of difficulty, submit a new question giving details of the prism.