Angles on Straight Lines. What: Sum of angles on straight lines How: Discovering how to measure angles at different points on straight lines Why:

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Angles in a straight line and around a point

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Angles on Straight Lines

What: Sum of angles on straight lines How: Discovering how to measure angles at different points on straight lines Why:

A o B

A O B

A O B

A OB

Definition: The sum of angles at each point on a straight line is 180 degrees.

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Harry is putting up some shelves He has made two holes in the wall He measure the angle between the two holes is 200 o Will the shelf be straight?

Plenary The sum of angles at each point on a straight line is 180 degrees Easy example Hard example