i'll check that website out, but here's one of the questions.
The figure above shows two pairs of parallel lines. which choice is the locus of points that are equidistant from all four lines?
A) The point of intersection of the diagonals of the parallelogram formed by the four lines
B)Two lines, one equidistant from (a) and (b) and the other equidistant from (c) and (d)
C) the line equidistant from (a) and (b)
D) There is no locus that fits the requirements
I'm not really sure what a locus is and how to go about answering the question....?