Question

va rog urgent,chiar am nevoie

Answer 1

BC²=AC²-AB²;

BC²=8²-4²

BC²=64-16

BC²=48

BC=√48

BC=4√3(cm);

BC=AD=4√3(cm);

A=AB*BC;

A=4*4√3=16√3(cm²);

m(<ACD)=30°;

Bafta!