![]() 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. Step 3: Once the value of the volume of the prism is obtained, write the unit of volume of prism in the end (in terms of cubic units). Step 2: Find the volume of the prism using the formula V B × H where V, B, and H are the volume, base area, and height of the prism. Using the wrong measurements to work out the area of the triangle faces Step 1: First write the given dimensions of the prism.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. Find the volume of a triangular prism if its base is 6 cm, altitude is 8 cm and length is 12 cm. 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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