Ex: Find a Point on the Unit Circle Given One Coordinate

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This video explains how to find the x-coordinate of a point on a unit circle given the y-coordinate and the quadrant.
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I forgot to write that formula in my notes and I was struggling with this trying to get the last few things in for the third quarter. Thanks so much this answered everything

kattapp
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Thank you so much, my teacher did not teach us this yet it’s on our final review so 🤷‍♂️

youmaya
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we can also find the unknown angle in this example: CosФ=X coordinate= 0.75. Now take Cos-1 for 0.75 which gives us 41 degrees. Now subtract 41 from 360 and we get 319 degrees which is the angle at this point.

saadahmed
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i did exactly this but stupid webassign keeps marking it wrong. not sure why

medicisounds