Question

The distance between A (a + b, a – b) and B(a – b, -a – b) is A) √a²+b² B)2√a²+b² C) a²+b² D) none of these

Answer 1

Answer:

AB^2={(a+b)-(a-b)}^2+{(a-b)-(-a-b)}^2

=4b^2+4a^2

=4(a^2+b^2)

AB=2√(a^2+b^2)

Ans: B