Question

Aria unui triunghi echilateral cu inaltimea de 6 cm este de ..cm patrati

Answer 1

$h=\dfrac{l\sqrt3}{2}=6\Rightarrow l=\dfrac{12}{\sqrt3}=4\sqrt3 \ cm$

$A=\dfrac{l^2\sqrt3}{4}=\dfrac{48\sqrt3}{4}=12\sqrt3\ cm^2.$