Question

Proving the verticle angle theorem problemIll send a picture of the question

Answer 1

Given:

$\angle1\text{ and }\angle2\text{ are vertical angle}$

Sol:.

$\begin{gathered} m\angle1+m\angle3=180 \\ m\angle2+m\angle3=180 \end{gathered}$

use both equation then use substitution property then.

$m\angle1+m\angle3=m\angle2+m\angle3$