Find the area of equilateral triangle whose side is $5 c m$

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Solution

Side of equilateral Triangle is $5 c m$
The area of triangle is given by $= \frac{\sqrt{3}}{4} a^{2} = \frac{\sqrt{3}}{4} \times 5^{2} = \frac{25 \sqrt{3}}{4} c m^{2}$

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