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Math Help - Polar and Rectangular Coordinates Please?

  1. #1
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    Polar and Rectangular Coordinates Please?

    Question 1: Write the polar coordinates (with r > 0 and 0 </= theta < 2pi) for the point with rectangular coordinates (0, 3).

    Question 2: Write the rectangular coordinates (x, y) for the point with polar coordinates (5, pi).

    My work for #2:
    x = 5 cos (pi) = 0
    y = 5 sin (pi) = 5
    Rectangular Coordinates: (0, 5)
    Is this right?

    I am really confused on these questions.

    Any help is really appreciated.
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  2. #2
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    Talking

    Quote Originally Posted by iluvmathbutitshard View Post
    Question 1: Write the polar coordinates (with r > 0 and 0 </= theta < 2pi) for the point with rectangular coordinates (0, 3).
    What formulas have they given you for this? How far have you gotten in applying them?

    Quote Originally Posted by iluvmathbutitshard View Post
    Question 2: Write the rectangular coordinates (x, y) for the point with polar coordinates (5, pi).

    My work for #2:
    x = 5 cos (pi) = 0
    y = 5 sin (pi) = 5
    Rectangular Coordinates: (0, 5)
    Is this right?
    What did you see when you plotted the polar point (5, pi)?

    What is the value of the cosine of pi? (Check the graph or the table of reference-angle values they wanted you to memorize.)

    What is the value of the sine of pi? (Check the graph or the table of reference-angle values they wanted you to memorize.)

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