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JoshKPatterson

  • 2 years ago

Find the point on the terminal side of θ = -(3pi/4) that has an x coordinate of -1. Show your work for full credit.

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  1. mathplane
    • 2 years ago
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    Great question... The best approach is to draw a picture...

  2. mathplane
    • 2 years ago
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    |dw:1364161840915:dw|

  3. JoshKPatterson
    • 2 years ago
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    Alright, so I'm looking for the y-coordinate I assume?

  4. NoelGreco
    • 2 years ago
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    That's positive 3pi/4

  5. mathplane
    • 2 years ago
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    You're right... let's make it negative 3pi/4

  6. mathplane
    • 2 years ago
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    |dw:1364162032750:dw|

  7. mathplane
    • 2 years ago
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    Since the angle is pi/4 --- or 45 degrees, we have a 45-45-90 right triangle...

  8. mathplane
    • 2 years ago
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    |dw:1364162159200:dw|

  9. mathplane
    • 2 years ago
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    So, from the graph, you can see the y-coordinate...

  10. JoshKPatterson
    • 2 years ago
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    square root of 2

  11. JoshKPatterson
    • 2 years ago
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    ?

  12. JoshKPatterson
    • 2 years ago
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    Oh wow nevermind it's -1

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spraguer (Moderator)
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