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    Subject

    Quantitative Aptitude

    Topic

    Areas & Volumes

    Find the area of a triangle whose sides measure 13 cm, 14 cm and 15 cm.

    ক)
    84
    খ)
    64
    গ)
    44
    ঘ)
    22

    Explanation

    Let a = 13, b = 14 and c = 15. Then s=12(a+b+c)s=\frac12\left(a+b+c\right) = 21 Area = [s(s−a)(s−b)(s−c)]\sqrt{\left[s\left(s-a\right)\left(s-b\right)\left(s-c\right)\right]} = (21×8×7×6)\sqrt{\left(21\times8\times7\times6\right)} = 84 sq.cm

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