Question

Question 11: Please help, Which statement(s) should be used in proving that vertical angles 1 and 3 are congruent?

Answer 1

B. m < 1 + m < 2 = 180; m < 2 + m < 3 = 180.

Explanation:

m < 1 + m < 2 = 180 so m < 1 = 180 - m < 2

m < 2 + m < 3 = 180 so m < 3 = 180 - m^2.

So by the transitive property of equality m < 1 = m < 3.