Angle RPQ is a right angle , by construction. VW is a straight line different from RS so one of the two angles VPQ or WPQ is strictly bigger than 90 degrees -- I will match the labels and declare VPQ to be the obtuse one and OPQ to be the acute one.
Angle RPQ is a right angle , by construction. VW is a straight line different from RS so one of the two angles VPQ or WPQ is strictly bigger than 90 degrees -- I will match the labels and declare VPQ to be the obtuse one and OPQ to be the acute one.
WHY IS IT OK TO DO THIS? Am I ruining the universality of the proof?