If ∆WKT has acute angles at K and T, and if show that R lies between K and T. (If R does n...

If ∆WKT has acute angles at K and T, and if show that R lies between K and T. (If R does not he between K and T, then either K-T-R or R-K-T; show in either case that a contradiction to the Exterior Angle Theorem occurs.)

*An important result of absolute geometry often taken for granted.