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**Lines, Angles and Shapes**

11 April 2017 Here are some facts about angles that you should know A square corner like this is called a: RIGHT ANGLE It measures 900 (90 degrees) 900

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**1800 on a straight line Push Push 900 900 Push Push 900 900**

= 1800 1800 on a straight line

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**b d a c Prove that x + y + z = 1800 y x z**

Line ab is parallel to line cd so… c

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**This angle must be x degrees**

y x z x This angle must be x degrees Line ab is parallel to line cd so c

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**This angle must be y degrees**

These are scissor angles so d y x z x c

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**This angle must be y degrees**

x z x These lines make corresponding angles so c

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y d y y x z x x, y and z make a straight line so these angles must add up to give a total of 1800 c

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