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    Question

    What is the total surface area of a pyramid whose base

    is a square with side 8 cm and height of the pyramid is 3 cm?
    A 169 cm² Correct Answer Incorrect Answer
    B 121 cm² Correct Answer Incorrect Answer
    C 144 cm² Correct Answer Incorrect Answer
    D 184 cm² Correct Answer Incorrect Answer

    Solution

    ATQ, Edge length of square base = 8cm height = 3cm Slant height of triangular faces = √3 2  + 4 2   =  5cm Total surface area = 82 + 4(0.5 × 8 × 5) =  64 + 80 = 144cm2 

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