In the xy-plane, the point (-2, 1) is the center of a circle. The point (-2, -3) lies inside the circle and the point (4, 1) lies outside the circle. If the radius r of the circle is an integer, then r =	Choose the correct choice from the following answers:
A) 2
B) 3
C) 4
D) 5
E) 6
An easy way to solve this question will be just to mark the points on the coordinate plane.   You'll see that the distance between the center (-2, 1) and the point inside the circle (-2, -3) is 4 units   (both points are on x=-2 line so the distance will simply be  1-(-3)= 
<gadget id="calculator"> 1-(-3)</gadget>
<output>4</output>
4)   So the radius must be more than 4 units.   The distance between the center (-2,1) and the point outside the circle (4,1) is 6 units   (both points are on y=1 line so the distance will simply be  4-(-2)= 
<gadget id="calculator"> 4-(-2)</gadget>
<output>6</output>
6)   So the radius must be less than 6 units, which implies 4 &lt; r &lt; 6, thus as r is an integer then r=5.   Answer: 5.
<result>D</result>
In the xy-plane, the point (-2, 1) is the center of a circle. The point (-2, -3) lies inside the circle and the point (4, 1) lies outside the circle. If the radius r of the circle is an integer, then r =