PLEASE HELP John writes the proof below to show that the sum of the angles in a triangle is equal to 180°.
Given: Wintersects ABC
vertex Cand is parallel
to AB
Prove: m21 +22+ m23 - 180
Reasons
Prool:
Statements
1. XVI AB
2.24 m2 - 25 - 180°
3.24 21:25 23
4. M24 = 21:25 - 23
5. m2 +22+ m23 - 180°
1.
2
3
4
5
Which of these reasons would John NOT need to use in his proof?
The sum of the angles on one side of a straight line is 180º.
If a statement about a is true and a rbthe statement formed by replacing a with b is also true.
When two parallel lines are cut by a transversal, the resulting alternate interior angles are congruent.
When two parallel lines are cut by a transversal, the resulting alternate exterior angles are congruent.