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Find the centre and radius of the circles`x^2+y^2-8x+10 y-12=0` |
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Answer» `x^(2)+y^(2)-8x+10y-12=0` Comparing with `x^(2)+y^(2)+gx+2fy+c=0` `2g=-8,2f=10,c=-12` `rArr" "g=-4,f=5,c=-12` `:.` Centre of circle `-=(-g,-f)-=(4,-5)` and radius `r=sqrt(g^(2)+f^(2)-c)` `=sqrt((4)^(2)+(-5)^(2)-(-12))` `sqrt(16+25+12)=sqrt(53)` units |
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