Question

Calculate the area and the height of an equilateral triangle whose perimeter is $60$ cm.

Answer 1

perimeter of equalateral triangle$=60cm$.

sidelength=$\frac{60}{3}=20cm$

area=$\frac{\sqrt{3}}{4}(20{)}^2$

$=173.20c{m}^2$

Area $=\frac{1}{2}\times 20\times Height$

$173.20=\frac{1}{2}\times 20\times Height$

$Height=17.32cm$