Please post only one question per thread. Otherwise things can become pretty complicated when there are discussions on multiple questions.

Cheers,
Brent

Hi phalgun,

I'm going to offer you some hints so that you can attempt this question again on your own:

1) Any time you see/draw a diagonal line on a graph, you can 'build' a right triangle around it (using the diagonal line as the hypotenuse of the right triangle).

For example, line segment PR would be the hypotenuse of a right triangle that has a base of 3 and a height of 4.

2) You can draw a rectangle 'around' that triangle (the upper-right corner of that rectangle would be Point R).

3) If you subtract the area of the right triangles from the area of the rectangle, then you'll have the area of whatever remains...

GMAT assassins aren't born, they're made,
Rich