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Change the cartesian coordinate point (-3,4) to polar.

I get r=5

and im getting theta = -53.13

my textbook says its supposed to be 126.9

 Feb 8, 2019
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Tan =  -4/3

Arctan(-4/3) = -53.130102354156+180 = 126.869897645844

 

-53 is the reference angle between  - pi/2   and + pi/2   so....

 

Think about the coordinate plane   the point    -3 , 4  is in Quadrant 2   and the answer is   126.87 degrees

 Feb 8, 2019
edited by ElectricPavlov  Feb 8, 2019

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