Question

the perimeter of an traingle is 60m.the srea is
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Answer 1

The perimeter of an triangle is 60 m.

We know that area of the :-

$s = \frac{a + b + c}{2} \\ \: \: \: = \frac{20 + 20 + 20}{2} \\ \: \: \: = \frac{60}{2} = 30$

Area of triangle=

$\sqrt{s (s-a)(s - b)(s - c)} \\ = \sqrt{30(30 - 20)(30 - 20)(30 - 20)} \\ = \sqrt{30 \times 10 \times 10 \times 10} \\ = 10 \times 10 \sqrt{3} \\ = 100 \sqrt{3} m^{2}$