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Ch-12 ex 12.1 Q1

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Ch-12 ex 12.1 Q1

    • Posted by Mohit Rathi 3 years, 9 months ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Nitya Gupta 3 years, 9 months ago

    Perimeter of an equilateral triangle=180cm , side of the triangle = a| Perimeter=sum of all sides| 180=a+a+a| 180 = 3a| a = 60| Area of the triangle by heron's formula| s=a+b+c/2| s=180/2=90| √90(90-60)(90-60)(90-60)| √90×30×30×30| √2×3×3×5×2×3×5×2×3×5×2×3×5| 3×2×3×5×2×5√3| 900√3cm².

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    Nitya Gupta 3 years, 9 months ago

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