Question

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

(6, -8)

Answer 1

this is just the pythag thrm at work such that:

x^2 + y^2 = r^2

Answer 2

you can test the options by squaring the point values, and adding them together, if they equate to teh square of the radius ... its good

Answer 3

so did i got it right?

Answer 4

lets chk, what is:

6^2
(-8)^2
10^2

Answer 5

36
64
100..

Answer 6

good,

and since 36+64 = 100; its a perfect fit