Question

A circle with center (–1, 2) passes through point (2, –2). Which is true?
The radius is the square root of 5.

The diameter is 10.

The equation is (x + 1)² + (y – 2)² = 10.

The circumference is 25 pi.

Answer 1

Distance between the center and the point (radius) = \[\sqrt{(2+1)^{2}+(-2-2)^{2}}\] = 5
Therefore, a is not true. Diameter is twice the radius, therefore diameter = 10 is true.

Answer 2

Thank you. That makes sense.

Answer 3

You're welcome. :)