Lesson 11: Triangles

11.1 Lines, angles and triangles: Why triangles are important

11.1 Lines, angles and triangles: Why triangles are important

11.2 Lines, angles and triangles: Types of triangle

11.2 Lines, angles and triangles: Types of triangle

11.3 Lines, angles and triangles: Acute-angled, obtuse-angled and right-angled triangles

11.3 Lines, angles and triangles: Acute-angled, obtuse-angled and right-angled triangles

11.4 Lines, angles and triangles: Basic geometrical terms for triangles

11.4 Lines, angles and triangles: Basic geometrical terms for triangles

11.5 Lines, angles and triangles: Rules for triangles

11.5 Lines, angles and triangles: Rules for triangles

11.6 Lines, angles and triangles: Rules for triangles - example

11.6 Lines, angles and triangles: Rules for triangles - example

11.7 Lines, angles and triangles: Rules for triangles - equal angles and equal sides

11.7 Lines, angles and triangles: Rules for triangles - equal angles and equal sides

11.8 Lines, angles and triangles: Rules for triangles - congruency

11.8 Lines, angles and triangles: Rules for triangles - congruency

11.9 Lines, angles and triangles: Rules for triangles - corresponding lines and angles

11.9 Lines, angles and triangles: Rules for triangles - corresponding lines and angles

11.10 Lines, angles and triangles: 4 ways to prove congruency

11.10 Lines, angles and triangles: 4 ways to prove congruency

11.11 Lines, angles and triangles: 4 ways to prove congruency (part 2)

11.11 Lines, angles and triangles: 4 ways to prove congruency (part 2)

11.12 Lines, angles and triangles: Why congruency is important

11.12 Lines, angles and triangles: Why congruency is important

Multiple Choice Questions