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Mathematics 13 Online
OpenStudy (anonymous):

In triangle QRS, angle R=30 degrees. Prove that angle S does not equal 150 degrees. I don't think it does, but I don't know how to explain that...

OpenStudy (campbell_st):

A triangle has 3 angles... that add to 180 you have 2 angles that add to 180... so you don't have a triangle... So to form a triangle the largest whole number that S can equal is 149... then you have your 3 angles 30 + 149 + 1 = 180

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