# Complementary Angles

## Two angles that add to 90 degrees.

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Complementary Angles
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## RWA Complementary Angles

### Topic

Angles in building

### Vocabulary

• Complementary angles

### Student Exploration

Making a table using complementary angles.

### Extension Investigation

1. Make a presentation of Complementary angles in Buildings - http://www.slideshare.net/keggert/angles-in-buildings http://www.slideshare.net/keggert/angles-in-buildings

#### Layering (optional)

1. Exploring Complementary Angles Another interactive lesson from Learn Alberta that teaches students about the properties of complementary angles. Focuses a lot on the importance of 90 degrees. http://www.learnalberta.ca/content/mec/flash/index.html?url=Data/5/A/A5A2.swf
2. Complementary and Supplementary Angle Pairs Practice - http://www.xpmath.com/forums/arcade.php?do=play&gameid=103

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