1 Angles Sum of a Quadrilateral Stage 5 - Year 9 Press Ctrl-A ©2009 – Not to be sold/Free to use.

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Presentation transcript:

1 Angles Sum of a Quadrilateral Stage 5 - Year 9 Press Ctrl-A ©2009 – Not to be sold/Free to use

2 Proof The sum of the angles in a quadrilateral is 360 o. Angle Sum of a Quadrilateral

3 A B C A + B + C + D D = 360 o The sum of the angles in a quadrilateral is 360 o. D Angle Sum of a Quadrilateral

4 A+110 o +80 o +120 o = 360 o A o = 360 o A = 50 o 120 o 80 o 110 o A Example 1 Angle Sum of a Quadrilateral

5 Example o 70 o 100 o 2A 2A+110 o +70 o +100 o = 360 o 2A o = 360 o A = 80 o A = 40 o ÷2 ÷2 Angle Sum of a Quadrilateral