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

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

Step-by-step 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.

the answer is b.

step-by-step explanation:

identity property is where 0+whatever number=whatever number. basically 0+ a number.