Question

Which statement must be true to prove.m<1 + m<2 + m<3=180°?

Answer 1

We have that m and n must be parallels in order to have the next diagram

where we have alternate angles that means that the angles in red are equals and the angles in green are equals

so the from the image of the problem we can say

m

the sum of the interior angles of a triangle is 180

so we can have

m<1 +m<2+m<3=180

The statement that must be true is A m || n