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If a chord of the circle x^2+y^2-4x-2y-c...

If a chord of the circle `x^2+y^2-4x-2y-c=0` is trisected at the points `(1/3,1/3)&(8/3,8/3)` , then `' c '` equal to: 10 (b) 20 (c) 40 (d) none of these

A

Length of the chord ` = 7sqrt(2)`

B

k = 20

C

Radius of the circle = 5

D

`k = 25`

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A, B, C
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