Name________________________

SUM OF THE INTERIOR ANGLES OF A TRIANGLE  #1

Directions:  Find the measurement of each missing angle in the triangles below.  Remember, the Triangle Sum Theorem states that the interior angles of a triangle always add up to 180̊.			  					

x

65̊

60̊

1)              	         	                2)                                              3)                                          4)  

60̊

x

35̊

40̊

60̊

x

x

50̊

   x = __   ___             	                   x = __    ___      		   x = __   ___       	               x = __    ___                 

x

x

52̊

137̊

37̊

5)                                           6)                                             7)                                           8)  

40̊

x

84̊

28̊

x

41̊

72̊

   x = __    __             	                   x = __   ___      		   x = __   ___       	               x = __    ___                 

73̊

x

x

65̊

9)              	         	               10)                                              11)                                          12)  

25̊

 

57.5̊

45̊

70̊

x

x

50̊

   x = __   ___             	                   x = _    ___      		   x = __   ___       	               x =      ___                 

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