Question

URGENT!VABC este o piramida triunghiulara regulata cu AB=4 radical din 3 si h 3cm.Afla Aria totala si Volumul!!!

Answer 1

baza ∆ echilateral
l=AB=4√3cm
h=VO=3cm
Ab=l^2√3/4
Ab=(4√3)^2√3/4=48√3/4=12√3cm^2
Pb=3l
Pb=12√3cm
OM=apb=l√3/6=4×3/6=2cm
in ∆VOM
ap^2=VO^2+OM^2
ap=√9+4=√13cm
Al=Pb×ap/2
Al=12√3×√13/2=6√39cm ^2
At=6√39+Ab=6√3(√13+2)cm^2
V=Ab×h/3
V=12√3×3/3=12√3 cm^3

Answer 2

Vezi rezolvarea din imaginea anexata !