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Q.

The length of the common chord of the circles x2+y22x+4y20=0,x2+y2+6x+10y2=0 is

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a

8

b

10

c

485

d

245

answer is C.

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Detailed Solution

C: centre O1(1,2), radius =5
C1 : centre O2(3,5), radius =6,
O1O2=16+9=5
The sides of ΔO1O2A are 5,6,5
Area of ΔO1O2A=8323=12
12=12AB2O1O2=AB45AB=485.

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