Is this correct?

Question

Find the distance between (9, -3) and (-1, 3)

(A) -5/3

(B) 10

(C) 2√15

(D) ∅

(E) None of these

For this I got; (E) None of the above, because I got 2√34.

Answer 1

Using the distance formula, I got the same answer as you.

Answer 2

You need a rt triangle (trigonometry). In this case the distance between 9 and -1 is 10.

Between -3 and 3 is 6; so a^2+b^2=c^2 or 6^2+10^2=136^.5=11.6619.......