Question

DAU COROANA
1.Piramida patrulatera regulata VABCD are latura bazei egala cu muchia laterala.Stiind ca AB=12 cm,aflati masura unghiului format de dreptele :
a) VD si BC;
b) DC si VB

Answer 1

a.m(VD,BC)=m(VD,AD)
AD||BC
AD=VD=VA(ip.)=>tr. VAD -echilat.=>m(VDA)=60'=>m(VD,BC)=60'
b.-||-