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Find the area of a triangle …

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Find the area of a triangle two side of which are 18cm and 10cm and the perimeter is 42 cm

    • Posted by Ziddi Rao Shabh. 5 years, 9 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Sia ? 5 years, 9 months ago

    Let a=18 cm, b=10 cm
    Perimeter =42cm
    ∴a+b+c=42cm
    So, C=14 cm
    ∴ S=a+b+c2 =18+10+142 = 21 cm
    new area of triangles =√21(21−18) (21−10) (21−14)= √21×3×11×7
    =21√11 sq cm

    1Thank You

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