21: A ngle Relationships in Parallel Lines and Triangles

21.1 Parallel Lines Cut by Transversal

Notes here

Video on this lesson here and here

Practice this lesson here

Video on finding eqations from angles here

practice finding equations and solving here and here


21.2 Angle Theorems for Triangles

  • Notes for interior angles here

Video on exterior angles using the remote interior angles here

practice on exterior angles here