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Demonstrate that the angle sum of a triangle is 180° and use this to find the angle sum of a quadrilateral (ACMMG166) * using concrete materials and digital technologies to investigate the angle sum of a triangle and quadrilateral

Screenshot of A Tangled Web, practise solving angles
A Tangled Web, practise solving angles
Screenshot of Angle Sum of Triangle using your IWB
Angle Sum of Triangle using your IWB
Screenshot of Doodling in Math Class: Triangle Party
Doodling in Math Class: Triangle Party
Screenshot of Exploring Angles within a Triangle - Maths Interactives
Exploring Angles within a Triangle - Maths Interactives
Screenshot of Polygon angle theorems: triangle through octagon
Polygon angle theorems: triangle through octagon
Screenshot of Sum of angles of a triangle
Sum of angles of a triangle
Screenshot of The geometer’s warehouse
The geometer’s warehouse
Screenshot of The Three Square Geometry Problem - Numberphile
The Three Square Geometry Problem - Numberphile
Screenshot of Triangle Angle Sum Exploration
Triangle Angle Sum Exploration
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