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 3 years ago
if the point P(3/5,y) lies on the unit circle and P is in the third quadrant, what does y equal?
 3 years ago
if the point P(3/5,y) lies on the unit circle and P is in the third quadrant, what does y equal?

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amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1the unit circle is made of cos, sin coords

MrYantho
 3 years ago
Best ResponseYou've already chosen the best response.0Since the x value is negative, we are talking left of the yaxis (Q2 or 3). We are told Q# so that means that our ycoord must also be negative. dw:1331832229558:dw Consider than creating a triangle by drawing a radius and drawing a line up to the xaxis

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1sin^2 + cos^2 = 1 ; was my first impression :) which is identical to MrYs instructions

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.1345 WAS a shortcut , cool lol

MrYantho
 3 years ago
Best ResponseYou've already chosen the best response.0Then, from the triangle example (and amistre) you can use pythagorean theorem to find the unknown side (which is also the ycoord) \[y^2=1^2+(\frac{3}{4})^2\] Solving this gives you 4/5, but you have to remember that since it is in Q3, it has to be negative.
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