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" 7."x^(2)+y^(2)-4x-8y-45...

" 7."x^(2)+y^(2)-4x-8y-45

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In each the following find the centre and radius of circles. x^(2)+y^(2)-4x-8y-45=0 .

In each the following find the centre and radius of circles. x^(2)+y^(2)-4x-8y-45=0 .

In each the following find the centre and radius of circles. x^(2)+y^(2)-4x-8y-45=0 .

Find the centre and radius of the circle x^(2)+y^(2)-4x-8y-45=0 ?

Find the centre and radius of the circles x^(2)+y^(2)-4x-8y-45,=0

Find the centre and radius of circles. x^(2)+y^(2)-4x-8y-45=0 .

In each the following find the centre and radius of circles. x^(2)+y^(2)-4x-8y-45=0 .

The centre of circle cutting the three circles x^(2)+y^(2)-4x-4y+5=0 , x^(2)+y^(2)-4x-6y+5=0 , x^(2)+y^(2)-4x-8y+5=0 orthogonally is

The angles between the straight lines joining the origin to the points common to 7x^(2)+8y^(2)-4xy+2x-4y-8=0 and 3x-y=2 is: