Geometry of a Straight Line
Gr 9

The Grade 9 Geometry of a Straight Line module develops the essential angle–relationship skills learners need to handle more advanced geometry in later grades. This chapter focuses on understanding how angles behave when points, lines, and transversals interact, and teaches learners how to apply these rules accurately in diagrams and problem-solving contexts.

The lessons cover fundamental concepts such as:

• Sum of angles on a line

• Vertically opposite angles

• Lines intersected by a transversal

• Parallel lines

• Alternate, corresponding and co-interior angles

• Exam Questions