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

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

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

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

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

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

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