SOLUTION: The Sum of the measures of the interior angles of any triangle is 180 degrees

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Question 664896: The Sum of the measures of the interior angles of any triangle is 180 degrees
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi,



 angle a, angle b, and angle c form a straight line, parallel to AC

 ***angle a + angle b + angle c = 180 degrees

angle a = angle x    ||| alternate interior angles equal 

angle b = angle y    ||| alternate interior angles equal 

angle x + angle y + angle c = 180 degrees  |||Substituting equal values into ***