2. CBQ - Angle sum property and Exterior angle property

A surveyor marks three road junctions \(P\), \(Q\), and \(R\) that form a triangle. The road \(PQ\) is extended to \(S\), creating an exterior angle \(122^{\circ}\) at \(P\). The angle at \(Q\) is \(41^{\circ}\).

 

 

1. The measure of \(\angle R\) is

 

2. The measure of the interior angle of \(P\) is

 

3. Using which of the following methods can the measure of interior angle of \(P\) be determined?

 

4. Triangle \(PQR\) is