a)l=18V3:3=6V3
b) P fetei laterale=28V3=2m+l=2m+6V3
2*m=22V3 ⇒ m=22V3:2=11V3
c)Ab=l^2V3/4=(6V3)^2V3/4=36*3V3/4=27V3 (aria trg echilateral de latura l)
d) A fetei laterale este aria unui trg isoscel cu latura congruenta m si latura de baza l (= l*h/2)
pt calculul h aplic T pitagora intr-un trg dreptunghic care are cateta l/2=6V3/2=3V3 si ipotenuza m=11V3
h^2=(11V3)^2 - (3V3)^2=121*3-9*3=336
h=V336=V3*2^4*7=2^2V21=4V21
A fetei laterale= 6V3*4V21/2=12V3*3*7=36V7
