Question

given: <1 and <2 are supplementary and<2 and <3 are supplementary prove: <1=<3 by definition supplementary angles m<1+m<2 = _______ andm<2+m<3=_________ then m<1+m<2=m<2+m<3 by the _________ subtract m<2 from each side you get m<1= ___ or m<1=_______________