The measurements on the triangular prism are in mm therefore the total surface area of the triangular prism 144mm2 144mm2. 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. 24+24+24+32+40144 24 +24 +24 +32 +40 144. 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. volume 0.5 b h length, where b is the length of the base of the triangle, h is the height of the triangle, and length is prism length. 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 total surface area (TSA) of a triangular prism is the sum of the lateral surface area and twice the base area. 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 The volume of a triangular prism is expressed in cubic units such as in 3. For a triangular prism the top and the base are triangles and the lateral faces are rectangular sides. The formula to find the volume is, Volume of a Triangular Prism area of base triangle × length, or it can also be written as × b × h × l, where b is the base length of the triangle, h is the height of the triangle, and l is the length between the triangular bases. 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. Lateral Area + + ++3 6 4 6 5 6 18 24 30 72() ()( ) cm2 The total surface area of the triangular prism is the lateral area plus the area of the two bases. the sum of the areas of the three rectangles. The surface area of a triangular prism is the total area of all of the faces. The lateral area of the triangular prism is the sum of the areas of the lateral faces i.e.
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