Question

The height of an equilateral triangle is 18 meters. Find the perimeter of the triangle

Answer 1

$h=18=\dfrac{a\sqrt3}{2}\\\\18=\dfrac{a\sqrt3}{2}\\ 36=a\sqrt3\\ a=\dfrac{36}{\sqrt3}\\ a=\dfrac{36\sqrt3}{3}\\ a=12\sqrt3\\\\ p=3a\\ p=3\cdot12\sqrt3\\ p=36\sqrt3$