xy-coordinate plane

Question

In the xy-coordinate plane, which of the following points is a distance of 6 from (0,0):

a (5, -1)

b (4, 2)

c (-2, 4)

d (-3, -3)

e (6, 0)

Answer 1

e.

square the x coordinate, then square the y coordinate. sum them. If they add to 36, the distance is sqr36=6

that's only true for e. 6^2 + 0^2 = 36