Which of the following points lies on the circle whose center is at the origin and whose radius is 2?

Answer 1

If the circle has a radius of 2 and is centered at the origin, points (0, 2), (0, -2), (2,0) and (-2, 0) are all on the circle as are any others that fit 4=√(x^2 + y^2). A circle is all points that are r units away from the center.

Answer 2

Great Q&A!

As already noted above, the general equation of a circle is x² + y² = r² in this case 2²=4. The most obvious solutions would indeed be those having one of the coordinates equal to zero, such that the other is ±2