Using the wrong measurements to work out the area of the triangle faces.To find surface area, work out the area of each face and add them together 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. Calculating volume instead of surface area.You can’t have some measurements in cm and some in mīe careful to apply the correct prism related formula to the correct question type. You need to make sure all measurements are in the same units before calculating volume.Į.g. Surface area is measured in units squared (e.g. You should always include units in your answer. Step-by-step guide: Surface area of a triangular prism Since it is an area, surface area is measured in square units (e.g. The triangular faces of a triangular prism are congruent (exactly the same) but, unless the triangle is an isosceles triangle or an equilateral triangle, the rectangles are all different.
The lateral surface area is the total area of the rectangular sides
For a triangular prism the top and the base are triangles and the lateral faces are rectangular sides. Lateral faces are all of the faces of an object excluding the top and the base. To work out the surface area of a triangular prism, we need to work out the area of each face and add them all together. The surface area of a triangular prism is the total area of all of the faces.
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