In surface area questions, we need to know all three side lengths of the triangle however we only need the base and the height to calculate the area of the triangle. Using the wrong measurements to work out the area of the triangle faces.Example: Calculate the surface area of a triangular prism with side 7 cm, base 5 cm and height 6 cm. To find surface area, work out the area of each face and add them together The Surface area of a triangular prism is given as: \\large ab+3bh\ Solved example. Volume and surface area are different things – volume tells us the space within the shape whereas surface area is the total area of the faces.
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