apoorva.srivastva wrote:HI pathaniaus
well the answer indeed is B...
i dint understand ur explantion
please enlighten me!!!
Pathaniaus takes a great approach to the question. A bit more detail about his (or her!) explanation:
The radius of a circle is the distance from the centre to the "edge". It's the greatest line segment that can be drawn inside a circle if you start in the middle.
Therefore, the distance from the centre to any point
inside the circle will be
less than the radius. Similarly, the distance from the centre to any point
outside the circle will be
greater than the radius.
Pathaniaus calculated the distance from the centre to those two points.
Centre: (-2, -3)
Point inside: (-2, 1)
Point outside: (4, -3)
Notice that the Centre and the point inside have the same x coordinate; therefore, the distance between the two points is simply the difference in y coordinates:
|-3 - 1| = |-4| = 4
(we use absolute value since distance is always non-negative).
Notice that the Centre and the point outside have the same y coordinate; therefore, the distance between the two points is simply the difference in x coordinates:
|-2 - 4| = |-6| = 6
Therefore we know that:
4 < r < 6
and since we know that r is an integer, r MUST be 5: choose (B).
Hope that helps!
