CBSE Class 10 Answered
Find the coordinates of the centre of the circle
passing through the points (0, 0), (-2, 1) and (-3, 2). Also, find its
radius.
![](http://images.topperlearning.com/topper/questions/219495_image102.jpg)
![](http://images.topperlearning.com/topper/questions/219495_image102.jpg)
Asked by Topperlearning User | 04 Jun, 2014, 13:23: PM
Let P(x, y) be the centre of the circle passing through the points O(0, 0), A(-2, 1) and B(-3, 2). Then,
OP = AP = BP
Now, OP = AP OP2
= AP2
x2 + y2 = (x + 2)2
+ (y - 1)2
x2 + y2 = x2
+ y2 + 4x - 2y + 5
4x - 2y + 5 = 0 ...(i)
Now, OP = BP OP2
= BP2
x2 + y2 = (x + 3)2 + (y - 2)2
x2 + y2 = x2 + y2 + 6x - 4y + 13
6x - 4y + 13 = 0 ...(ii)
On solving equations (i) and (ii),
we get x = and y =
Thus, the coordinates of the
centre are
Now, radius = OP =
Answered by | 04 Jun, 2014, 15:23: PM
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