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anonymous

  • 4 years ago

Find the sin and cos of theta. (diagram)

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  1. anonymous
    • 4 years ago
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    |dw:1328328468937:dw|

  2. Mertsj
    • 4 years ago
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    Remember that sin is side opposite/hypotenuse and cos = side adjacent/hypotenuse. \[\sin \theta = \frac{12}{13}\]

  3. Mertsj
    • 4 years ago
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    \[\cos \theta=\frac{-5}{13}\]

  4. anonymous
    • 4 years ago
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    theta doesn't equal 360 minus the angle between 5 and 13, just 180 minus that angle... is it still that simple?

  5. Mertsj
    • 4 years ago
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    So yes. After you find your reference angle, subtract it from 180 to get the angle measured counterclockwise from the positive x axis.

  6. anonymous
    • 4 years ago
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    how do you find the reference angle?

  7. dumbcow
    • 4 years ago
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    depends on which quadrant you are in: Let A be the angle, R be reference angle Quad 1: R =A Quad 2: R = 180-A Quad 3: R = A-180 Quad 4: R = 360 -A

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