Am nevoie urgent !!!!!!va rog dau coroana !!!!

Răspuns:
4.se face ∆AOB≈∆DOC{ABllDC;=>
AB/DC=AO/OC
6/10=3/5=AO/OC
AO+OC=8;3+5=8=>AO=3cm
6.V=lLh
diagonala bazei
=√100-64=√36=6cm
l=√36-27=√9=3cm
V=3×3√3×8=72√3cm³