Question

Determine a medida da altura de um triângulo equilátero cujo lado mede 6 cm.

Answer 1

$A= \frac{L^2 \sqrt{3} }{4} \\\\\\ A= \frac{6^2 \sqrt{3} }{4}\to \\\\\\ A= \frac{36 \sqrt{3} }{4}\to \\\\\\ A= 9 \sqrt{3} cm^2$