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Answer:
Let centre of circle be O(0,0) and the point be A(4,3)
OC is radius (dist. btwn centre and any point on the circumference )
Distance between 2 points =
∴OC = /(3-0)^2 + (4-0)^2
= /9+16
= /25 = 5 units
∴ radius is 5 units long