Geometry

Essential Mathematics Year 9

Welcome

Learning objectives

Recap of past learning

Polygon: A missing parrot!!!!

Types of polygons: Convex and non-convex

Regular polygons

Finding the sum of the interior angles of any polygon

Formula for sum of interior angles

Sum of exterior angles of a polygon

Properties of quadrilaterals

Example 1: Finding angles in quadrilaterals

Example 2: Finding angles in quadrilaterals

Example 3: Finding angles in quadrilaterals

Example 4: Finding angles in polygons

Example 5: Finding angles in polygons

Final words and summary

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