okay, this has a drawing that I can't duplicate...but will describe:
In the figure above, points P and Q lie on the circle w/ center O. What the value of S?
The picture is an x-y axis with a semi-circle that's center is at point O (coordinates are 0,0 on the x-y axis. so the x axis is what cuts the full circle in half if you get what I mean. then there are 2 lines drawn from point O (o,o) to 2 points on the semi-circle. One drawn diagnoaly to the left, the other diagnolly to the right. These are obviously radii. The one on the left is labeled point P (-sqrt3, 1) and the one on the right is point Q (s,t). Also, the resulting angle formed from where the 2 lines are drawn from the center of the circle is a right angle.
the answer choices:
c. radical 2
d. radical 3
e. (radical 2) /2