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Here,
The eqn of circle passing through centre is
x^2+y^2=r^2
Since,it passes through the point(0,10) replace the value of x by 0 and y by 10...
0^2+10^2=r^2
or,100=r^2
therefore,
r=10
The eqn of circle is x^2+y^2=10....
HOPE THIS HELPS YOU!!!!!
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