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    Question

    A square whose diagonal is 12тИЪ 2cm is made base of the

    pyramid. if height of the pyramid is 15cm, then what is the total surface area of the pyramid.(cm 2)
    A 72(2+тИЪ29) Correct Answer Incorrect Answer
    B 2(2+тИЪ29) Correct Answer Incorrect Answer
    C 27(2+тИЪ29) Correct Answer Incorrect Answer
    D 72(6+тИЪ29) Correct Answer Incorrect Answer

    Solution

    Diagonal of square =aтИЪ┬а2 = 12 тИЪ┬а2cm a=12cm ┬а┬а┬а┬а┬а┬а┬а┬а┬а┬а For square base of pyramid тАУ now total surface area of pyramid =Area of base +1/2 ├Чperimeter of base ├Чslant height = (12)2+(4├Ч12)/2 x3тИЪ29 =144+72тИЪ29 =72(2+тИЪ29) cm2

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