Question

5. Which theorems or postulates could you use to find m<1 in the previous question? (Select 2)

A) same-side interior angles theorem
B) vertical angles theorem
C) triangle angle-sum theorem
D) triangle exterior angle theorem
E) alternate exterior angles theorem

Answer 1

C & D

Explanation:

Use Triangle Angle-sum theorem to find the missing interior angle.

63+60+?=180. Subtract the sum of 63+60 (or 123) from 180 to get 57.

Use Triangle Exterior Angle theorem because m1 + the sum of the given angles are equal.

So 63+60=123 so m1=123

Answer 2

I think it's D) triangle exterior angle theorem