Răspuns:
Explicație pas cu pas:
Inlocuiesti in formule
G1.S1. |a|=VxA^2+yA^2=V1^2+2^2=V1+4=V5
G2.S2. |a|=VxA^2+yA^2=V2^2+1^2=V4+1=V5
G3.S2. |AB|=V(xB-xA)^2+(yB-yA)^2=V(-2-1)^2+(0-3)^2=V(-3)^2+(-3)^2 =V9+9=V18=V3^2*2=3V2
G4.S2. |-a|=|a|=VxA^2+yA^2=V1^2+2^2=V1+4=V5