SOLUTION: two angles in a triangle add up to 138 degrees what is the size of the third angle

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Question 911515: two angles in a triangle add up to 138 degrees what is the size of the third angle
Answer by DN(2) About Me  (Show Source):
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The sum of interior angles of a triangle add up to 180 degrees. Therefore if the sum of two angles is 138 degrees, then the third angle is 180-138 degrees = 42 degrees.