# 9.3 Classifying Angles

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Published on January 12, 2008

Author: mrwilliams

Source: slideshare.net

9.3 ­ Classifying Angles Objective: Classify angles and find angle measures. Image: '[mb] Fluorescent Tunnel 6' www.flickr.com/photos/19723192@N00/345237858 1

Right Angle Acute Angle Obtuse Angle Straight Angle 2

Right Angle  ­ any angle whose  measure is exactly  90 degrees. 3

Acute Angle An angle whose measure is  less than 90 degrees. Image: 'From the skies above...' www.flickr.com/photos/40955206@N00/137067985 4

Obtuse Angle An angle whose measure is between 90 and 180 degrees. 5

Straight Angle An angle whose measure is exactly 180 degrees. Image: 'walkin9...good for health' www.flickr.com/photos/14448739@N00/276945493 6

Your Turn: In your math notes and with your group work on PAGE 430  Problems 1 ­ 4 7

Vertical Angles A ­ Angles opposite each other. B ­ Have equal measures. Angle A = 135 degrees Angle B = 8

Complementary Angles ­ Two angles whose sum of their measures is 90 degrees. es re eg 0 d es re 6 eg  d 30 9

Supplementary Angles ­ Two angles whose sum of their measures is 180 degrees. 120 degrees 60 degrees 10

Your Turn: In your math notes and with your group work on PAGE 431  Problems A & B 11

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