Question

ABC echilateral
AB=6cm
Cond:Pabc=?
Aabc=?
l.m.=?

Answer 1

P ΔABC=3*l=3*6=18 cm

$A_{ABC}= \dfrac{ l^{2} \sqrt{3} }{4} = \dfrac{36 \sqrt{3} }{4} =9 \sqrt{3}\ cm^{2}$

l.m. (care banuiesc ca e linia mijlocie)=l/2=6/2=3 cm