Question

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Answer 1

Answer:

In an equilateral triangle having a side of a units. having altitude of l units.

This property is used.

$5 {a}^{2} = 4 {l}^{2} \\ = > 5 \times {( \frac{2}{ \sqrt{3} }) }^{2} = 4 {l}^{2} \\ = > 5 \times \frac{4}{3} = 4 {l}^{2} \\ = > \frac{5}{3} = {l}^{2} \\ = > \sqrt{ \frac{5}{3} } = l$

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