Math

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plot the point given in polar coordinates and find the corresponding rectangular coordinates for the point.

(-1 , -3pi/4)

I do not understand.

  • Math -

    Are you more comfortable thinking in degrees?

    -3π/4 radians = -135° ( clockwise)
    -135 is coterminal with +225°
    so we could write our point as
    (-1,225°)
    which is the same as (+1 , +45°)

    so x = cos45/1 = √2/2
    y = sin45/1 = √2/2

    the point is (√2/2,√2/2)

  • Math -

    Thank You!

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