Question

The length of a side of an equilateral triangle is 10 inches. What is the length of an altitude of the triangle?

Answer 1

The altitude of an equilateral triangle with side length $a$ is $\frac{a\sqrt{3}}{2}$.

So, the length of the altitude is

$10 \cdot \frac{\sqrt{3}}{2}= 5\sqrt{3}$