Q. If ABC is a right angle triangle with angle A = 900 and 2s = a + b+ c, where a > b > c where notations have their usual meanings, then which one of the following is Correct?

1. (s - b) (s - c) > s (s - a)
2. (s - a) (s - c) > s (s - b)
3. (s - a) (s - b) < s (s - c)
4. 4s (s - a) (s - b) (s - c) = bc