Geometry of 2D Figures
Gr 9

The Grade 9 Geometry of 2D Shapes module builds a strong understanding of the properties, relationships, and reasoning techniques used to analyse two-dimensional figures. This chapter helps learners recognise key geometric principles and apply them confidently in problem-solving situations.

The lessons cover essential concepts such as types of triangles and quadrilaterals, interior and exterior angles, angle relationships, parallel and perpendicular lines, and the properties that define each 2D shape. Students learn how to use geometric reasoning to justify answers, determine unknown angles, and interpret diagrams accurately. Clear explanations and worked examples guide learners through each concept, reinforcing both understanding and application.

By the end of this module, students will be able to identify and classify 2D shapes, use angle properties to solve problems, and apply geometric logic effectively—a crucial skill set for higher-level geometry in Grade 10 and beyond.