Convert the Cartesian coordinates (2, -2) to polar coordinates. (2√2, 315°) (2√2, 330°) (2√2, 345°)
2 answers:
Convert the Cartesian coordinates (2, -2) to polar coordinates. (2√2, 315°) (2√2, 330°) (2√2, 345°)
To convert from Cartesian Coordinates (x,y) to Polar Coordinates (r,θ):
r = √ ( x² + y² )
θ = arctan ( y / x )
r = √ [ 2² + (-2)² ] = √8 = 2√2
θ = arctan ( y / x ) = arctan (-2/2)
θ = arctan (-1) = n180º + 135º = nπ + 3π/4 => n=0, +-1, +-2, +-3...
So, a principal value of arctan(-1) in [0, π] is 3π/4 = 135º
There is another in [0, 2π] => 1π + 3π/4 = 7π/4 = 180º + 135º = 315º
Answer : (2√2, 315°)
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