Assignment:
Give an indirect proof of the theorem.
Q1. If two lines are parallel to a third line then they are parallel to each other
Q2. Solve the equation S=(n-2) 180 degrees for n when S is a given value. Find the number of sides of the polygon ( if possible) if the given value corresponds to the number of degrees in the sum of the interior angles of a polygon.
Provide complete and step by step solution for the question and show calculations and use formulas.