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Mathematics 9 Online
OpenStudy (anonymous):

Medal!! Sarah used her calculator to find sin125. She wrote down sin125 = -.57. How could Sarah recognize her answer is incorrect?

OpenStudy (anonymous):

125 is in the 2nd quadrant (between 90 and 180) sin is positive in this quadrant.

OpenStudy (anonymous):

but how could she recognize her answer was wrong? @BangkokGarrett

OpenStudy (anonymous):

It can't be -.57, because that is a negative number. sin has to be positive in the 2nd quadrant.

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