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Find the equation of circle with center at origin and radius 5 units.(a) x^2+y^2=25(b) x^2+y^2=5(c) x^2=25(d) y^2=25I had been asked this question during an online exam.The query is from Conic Sections in division Conic Sections of Mathematics – Class 11

Answer»

Right OPTION is (a) x^2+y^2=25

Explanation: EQUATION of CIRCLE with center at (a, b) and radius R units is

(x-a)^2+(y-b)^2=r^2

So, equation of circle is (x-0)^2+(y-0)^2=5^2 => x^2+y^2=25.



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