# 9.4 Classifying Triangles

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Published on January 12, 2008

Author: mrwilliams

Source: slideshare.net

Mr. Williams GESD jwilliams@gesd40.org 9.4 Classifying Triangles Objective: Classify triangles  by their angles and sides. Image: '< < <' www.flickr.com/photos/57301170@N00/1938697463 1

Acute Triangle ­ Has three acute  angles. Image: 'Quack' www.flickr.com/photos/44124404848@N01/45433962 2

Obtuse Triangle ­ A triangle with  one obtuse angle. http://www.flickr.com/photos/cvangundy4/480668676/ Obtuse Triangle 3

Right Triangle ­ A triangle  with one right  angle. http://www.flickr.com/photos/cvangundy4/480664752/ 4

Your Turn: In your group classify the triangles  by their angles. pg. 436  problems 1 ­ 3 Image: 'Ławki w Olympiastadion w Monachium' www.flickr.com/photos/92011564@N00/267683634 5

Equilatral Triangle A triangle that has  all three sides the  same length. Image: 'Splash3' www.flickr.com/photos/73491156@N00/477332444 6

Isosceles Triangle A triangle that has  two sides the same  length. 7

Scalene Triangle A triangle that has  three sides of  different lengths. 8

The angles on a  triangle always add  up to 180 degrees! Image: 'ATT….EN……TION…..' www.flickr.com/photos/7166367@N05/1534572737 9

Your Turn: With your group, answer  questions 1 ­ 10 on p. 438. 10

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