provimg statements about segmants and angles. (question in the more information)

Question

Given: M<1 =59, M<2+=59  

Prove: M<1=M<2  

Statements: 1.)M<1=59, M<2 = 59

2.) 59 =m<2

3.) m<1, M<2

Reasons:

1.) Given

2.) Symmetric property equality

3.) __________