Question

Determinati aria unui triunghi echilateral de latura 4 cm. REPEDE VA ROGGG

Answer 1

$l=4 \ cm \\ A= \frac{l ^{2} }{2} \\ A= \frac{4^2}{2} \\ A= \frac{16}{2} \\ \boxed{A=8 \ cm^2}.$