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©G Dear2008 – Not to be sold/Free to use Mathematic (Preliminary) Geometry Types of Triangles Stage 6 - Year 11 Press Ctrl-A ©G Dear2008 – Not to be sold/Free to use

Based on Sides Types of Triangles Equilateral a. Three equal sides. b. Three equal angles (60o).

Based on Sides Types of Triangles Isosceles a. Two equal sides. b. Two equal base angles.

Based on Sides Types of Triangles Scalene a. No equal sides. b. No equal angles.

Based on Angles Types of Triangles Acute Angled All angles are a acute angles < 90o

Types of Triangles Based on Angles Acute Angled One Right Angle = 90o

Obtuse Angled Triangle Types of Triangles Based on Angles Obtuse Angled Triangle One Obtuse Angle >90o and <180o