Question

Care este aria unui triunghi echilateral cu latura de 4 cm ?

Answer 1

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

Answer 2

A=(l×h)/2
h=(l√3)/2
h=2√3
A=(4×2√3)/2
A=8√3/2
A=4√3