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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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9.4 Classifying Triangles