find the missing coordinate and then plot the point of x=-2, r=15 and the point is in QII.
2007-08-28 16:52:33 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
x^2 + y^2 = r^2, so that y^2 = r^2 - x^2 = 225 - 4 = 221.
Thus y = + sqrt 221 = + 14.866..., where the sign is '+' because it's in the 2nd quadrant.
QED
Live long and prosper.
NB "Find the missing coordinate" is a little ambiguous because there are both (rectangular) Cartesian coordinates (x, y) and polar coordinates (r, θ), and you have given just one of each. Thus there's a question: which KIND of coordinate did you consider was missing? So, just in case you had θ in mind as the "missing coordinate", IT is given by θ = arccos (x/r) = arccos (- 2/15) = 97.6623... degrees = 1.70453... radians.
2007-08-28 16:59:02 · answer #1 · answered by Dr Spock 6 · 1⤊ 0⤋
in quadrant II there are a lot of points where x = -2 and r =15
2007-09-01 23:49:48 · answer #2 · answered by Will 4 · 0⤊ 0⤋