SOLUTION: If the measure of one angle is twice the measure of its supplement, than how many angles are there, what is there relationship and how can you use algebra to solve it?

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Question 491510: If the measure of one angle is twice the measure of its supplement, than how many angles are there, what is there relationship and how can you use algebra to solve it?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
x+2x=180
3x=180
x=60
2x=120