Question

Does the point (4, 5) lie on the circle whose center is (-2, 2) and radius is 9?

Answer 1

circle equation would be
(x+2)^2 + (y-2)^2 = 81
sub in the point (4,5)
6^2 + 3^2
= 36 + 9
≠ 81 , so no ...

or:
radius = √(4+2)^2 + (5-2)^2) = √(36+9) = √45 ≠ 9 , so again: NO