9.2 angles

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9.2 ­ AnglesObjective: Name, measure, and draw angles.Mr. WilliamsGESDjwilliams@gesd40.org

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Angle

Formed by two rays with the same endpoint.

Image: 'green lines'www.flickr.com/photos/69005233@N00/38027252

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Vertex

The endpoint of the rays that form the angle.

Image: 'green lines'www.flickr.com/photos/69005233@N00/38027252

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Naming Angles

You can name an angle by its vertex.

   B

A B

C

Image: 'obrint pas:on vas'www.flickr.com/photos/41754875@N00/1068925369

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Naming Angles

You can name an angle by its vertex and two points.

   ABC              CBA

The vertex is always in the middle.

A B

C

Image: 'obrint pas:on vas'www.flickr.com/photos/41754875@N00/1068925369

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Image: 'Desks'www.flickr.com/photos/31136139@N00/1663782172

Your Turn:

With your group work on

pg. 425 problems 1 ­ 3

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Image: 'hard math'www.flickr.com/photos/41894176272@N01/201844037

Using a Protractor

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Image: 'Desks'www.flickr.com/photos/31136139@N00/1663782172

Your Turn:

With your group draw angleswith the following degrees:

60o, 75o, 35o, 90o, 115o, 170o