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    Question

    The length of the each side of an equilateral triangle

    is 21тИЪ3. The area of incircle, (cm 2 ) is
    A 154 cm┬▓ Correct Answer Incorrect Answer
    B 38.5 cm┬▓ Correct Answer Incorrect Answer
    C 1936 cm┬▓ Correct Answer Incorrect Answer
    D 346.5 cm┬▓ Correct Answer Incorrect Answer

    Solution

    Area of incircle of a тИЖ = ╧Аr 2 ┬а =╧А(a/(2тИЪ3)) 2 = ╧А((21тИЪ3)/(2тИЪ3)) 2┬а ┬а┬а =╧А ├Ч (10.5)2 ┬а =(22/7) ├Ч 10.5 ├Ч 10.5┬а = 346.5 cm2

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