Question

Fie ∆ABC,[AB]=[AC] m(A)=38,m(B)=?

Answer 1

Fiindca AB=AC=> ABC tr isoscel=> m(B)=m(C)=(180-m(A))/2=(180-38)/2
=142/2=71 Grade 

Answer 2

ab=ac rezulta ∆ isoscel deci unghiurile de la baza sunt congruente deci: m(A)+2*m(B)=180
2*m(B)=180-m(A)
2*m(B)=180-38
2*m(B)=142
m(B)=142/2=71