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    Question

    What is the total surface area of a pyramid whose base

    is square with a side of 8 cm and the height of the pyramid is 3 cm?
    A 169m┬▓ Correct Answer Incorrect Answer
    B 121m┬▓ Correct Answer Incorrect Answer
    C 144m┬▓ Correct Answer Incorrect Answer
    D 112m┬▓ Correct Answer Incorrect Answer

    Solution

    The side of the square = 8cm and the height of the pyramid =3cm┬а Now the area of the base = (8) ┬▓= 64m┬▓┬а And perimeter = 4 ├Ч 8 = 32cm Slant height= l┬▓ = h┬▓ + (BC /2) ┬▓ l┬▓ = 9+16 =25 l = 5cm┬а The total surface area of the pyramid = (1/2├Ч perimeter of base ├Чslant height) + area of base┬а = (┬╜ ├Ч32├Ч5) +64 = 80+64 =144cm

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