Angle Properties   

Interior Angles 

Triangle: all triangles add up to 180 degrees  

 

 

Pentagon: 5 sided shape.(180 x 3=540)   

 

Quadrilateral: 4 sided shape, Angles add up to 180 degrees. (180degrees x 3=360)

 

 

sides:    |3   |4    |5    |6    |7     |8
Triangle:|1  |2    |3    |4    |5     |6                                  
Sum <: |180|360|540|720|906|1080          *Angle total=(sides - 2) x 180

Supplementry angles

A+B= 180 degrees

* adds up to 180 degrees*

 

 

 

 

Exterior Angles

<S + <R=180
<R + <Q + <P=180
<S + <Q + <P=180








360degrees
-  80degrees
- 115degrees
- 70  _degrees
 95 degrees

or you can do it backwords
  
100degrees
 +  65degrees
+110degrees
+  85_degrees
360degrees

 

 

Interior <          
  108degrees                   
+108degrees                  
+108degrees                 
+108degrees                  
+108degrees                 
  540degrees                  



Exterior<                                                    
                                                                                 72degrees
                                                                                  + 72degrees
                                                                                  +72degrees
                                                                                   + 72degrees
                                                                                   +72degrees   
                                                                                        360degrees                                                            

 

 Loonie

 

(sides-2)x180

(11-2)x180=1620  

1620/11=147.2727                                   

 exterior angle: 180 -     147.2727=32.727272

                                                     Exterior sum = 360degrees