1)
16-16:4=16-4=12
2)
x=10*20/100=200/100=2
3)
1
4)
Daca O intersectia diagonalelor, AO=OC=16/2=8
Daca O intersectia diagonalelor, OB=OD=12/2=6
AB^2=AO^2+OB^2
AB^2=8^2+6^2
AB^2=64+36=100
AB=10
5)
V=pi*r^2*h=pi*3^2*6=36pi
6)
Elevi cu cel putin 9: 5+3=8
Elevi cu cel mult 4: 0+0+1+2=3
8-3=5
