Explicație pas cu pas:
a)Dacă CE_|_AB
=> CE||AD. |
CE=AB | =>AECD-paralelogram
=>DC=AE=10cm
AB=AE+EB
10+EB=16
=>EB=6cm
b)AB||CD. |
BD-secanta | =>m(ABD)=m(BDC) |
m(ABD)=m(DBC)|
=>triunghiul BDC -isoscel
=>CD=BC=10cm
AB||CD. | PB||CD
PBinclus(AB) |
PB||CD. |
DC=CB. |
CP_|_BD | =>DPBC - romb =>DP||BC