Question

Which of the following points lies on the circle whose center is at the origin and who’s radius is 10

(-6,4)
(10, 10)
(6,-8)

Answer 1

(6, -8)

Explanation:

The equation of this circle is:

x² + y² = 10²

Note that (6, -8) satisfies this equation, as

6² + (-8)² = 36 + 64 = 100.

The other two given points do not satisfy this equation.