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The centre of a circle is at O(4, 4) and the circle passes through the point (4, 9) on a grid.
The radius is the distance from the centre to that point along the vertical line .
What is the radius of the circle (in units)?

Class 8Coordinates of a PointCoordinate Geometry
  • A10
  • B5
  • C4
  • D6

Step-by-Step Solution

Centre (4, 4) and point (4, 9) share , so the distance is 9 - 4 = 5 units. The radius is 5.
Answer: B) 5

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