The sum of measure of 2 angles is 100 degrees. What is the measure of 3rd angle?

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The only way to solve this problem is by saying that all three angles add up to equal 180 degrees. And since 2 angles add up to equal 100 degrees, then you need another 80 degrees to equal 180. Therefore, the only possible answer is 80 degrees for the measure of the 3rd angle!!