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if the point P(3/5,y) lies on the unit circle and P is in the third quadrant, what does y equal?
 2 years ago
 2 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?
 2 years ago
 2 years ago

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amistre64Best ResponseYou've already chosen the best response.1
the unit circle is made of cos, sin coords
 2 years ago

MrYanthoBest ResponseYou've already chosen the best response.0
Since 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
 2 years ago

amistre64Best ResponseYou've already chosen the best response.1
sin^2 + cos^2 = 1 ; was my first impression :) which is identical to MrYs instructions
 2 years ago

amistre64Best ResponseYou've already chosen the best response.1
345 WAS a shortcut , cool lol
 2 years ago

MrYanthoBest ResponseYou've already chosen the best response.0
Then, 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.
 2 years ago
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