Pls help:)) marking people

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Which statements describe the solutions to the inequality x< -20 check all that apply. there are infinite solutions. each solution is negative. each solution is positive. the solutions are both positive and negative. the solutions contain only integer values. the solutions contain rational number values.

Which polygon is she in the process of constructing ?