![]() Thus, the lateral surface area of pentagonal prism = 5bh = 5 × 20 × 15 = 1500 sq units Given that: base length = 20 units, apothem length = 15 units, and height =15 units. Solution: As we know, the total surface area of the pentagonal prism is 5ab + 5bh, and the lateral surface area of a pentagonal prism is 5bh. Therefore, the total surface area of the pentagonal prism, TSA = 5ab + 5bhĮxample: Find the total surface area of the pentagonal prism and lateral surface area of the pentagonal whose base length is given as 20 units, apothem length is 15 units and height is 15 units. ⇒ Total surface area of pentagonal prism = 5ab + 5bh ![]() The total surface area of pentagonal prism = 5 × area of the base of pentagonal prism + lateral surface area of the pentagonal prism Therefore, the lateral surface area of the pentagonal prism, LSA = 5b × h = 5bh Thus, the lateral surface area of a pentagonal prism can be given by finding the perimeter of the base of the prism multiplied by its height. In general, the lateral surface area of a prism is equal to five times the product of its base and height. In order to determine we cut the pentagonal prism into its net and open it. ![]() Let us take a pentagonal prism, apothem length of the prism is "a", the base length of the prism is "b", and height of the prism is "h. Thus, the perpendicular drawn from one vertex of one base to the other base of the prism will be taken as its height.ĭerivation of Surface Area of Pentagonal Prism In the case of an oblique pentagonal prism, the bases are not perpendicular to each other.In the case of a right pentagonal prism, the bases are perpendicular to each other.In the case of a regular pentagonal prism, both the pentagonal sides are of equal length, and the five rectangular sides with bases being perpendicular to each other.The pentagonal prism formula for calculating surface area remains the same for all kinds of pentagonal prisms. Lateral Surface Area, L = Ph = 5bh sq.If the apothem length of the prism is "a", the base length of the prism is "b" and the height of the prism is "h", the surface area of a pentagonal prism is given as: The surface area of a pentagonal prism gives the area of each face of the prism. ![]() A pentagonal prism has two kinds of surface area:
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