Question

Which of the following points is on the unit circle?

Answer 1

Answer Choices

Answer 2

the unit circle is a circle of center (0,0) and radius 1 and of equation: x2 + y2 = 1
there are two approaches to get the answer
1) the coordinates of the point must satisfy the equation (x2 + y2 = 1)
2) the distance between the point and the origin is equal to 1

Answer 3

x*2 + y^2 = 1

try each of the pairs and find one which fits the above formula

Answer 4

Thanks for the help. Is D correct?

Answer 5

you are right
and welcome :)

Answer 6

awesome, thanks again