Răspunsuri

2014-06-13T17:35:29+03:00
a)
AB²
=2√3²+BD²
AB²=4*3+AB²:4
4AB²=4*4*3+AB²
3AB²=16*3
AB²=16
AB=4cm

b)BD=AB:2=2cm

c) Aria=BC*AD:2=4*2√3:2=4√3