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🔍 PREVIEW MODE – Only you can see this. Back to Admin EduTek Lesson Notes Shop Print PDF Home › SS › Mathematics › Geometry II – Triangles & Pythagoras Theorem SS 1 Geometry II – Triangles & Pythagoras Theorem Mathematics SS 1 Third Term Introduction to Triangles A triangle is a polygon with three sides, three angles, and three vertices. The sum of the interior angles of any triangle is always 180°. 📌 Key Concepts: Triangle: Three-sided polygon. Vertices: The corners of a triangle. Interior Angl [Preview only]