Răspuns:
a) A+B+C =180 grade
<) B=C
<)B=2A
A+2A+2A =180
5A =180
A=180:5 =36 grade
B=2*32=72 grade ; ( C=72 grade) =>
b) B/2=72/2 =36 grade C =72 grade =>MBC = isoscel (BM=BC)
c) A=45 grade
,) B=2A =2*45 =90 grade => <) C =45 grade
<( A=C=45grade=> ABC = isoscel
=.AB=BC =>BM=bisectoare, mediana,mediatoare axa de simetrie , perpendiculara
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