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Question

The radius of the circle (x5)(x1)+(y8)(y4)=0 is

A
8 units
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B
4 units
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C
22 units
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D
32 units
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Solution

The correct option is C 22 units
Equation of the circle is (x5)(x1)+(y8)(y4)=0
Hence, end points of diameter will be (5,8) and (1,4)
Radius, r=(51)2+(84)22
r=22 units

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