bisector

Given: <RST ~ <WSU Prove: m<RSW = m<TSU <RST < WSU. (Given) <RSW = <RST + <TSW (Angle Addition Postulate) <TSU = <TSW + <WSU (Angle Addition Postulate) Since <RST = <WSU (Given), we have: <RSW = <WSU + <TSW Therefore, <RSW = <TSU