The equation of the circle having centre at the origin and passing through the point (3,4), is
A
x2+y2=9
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B
x2+y2=16
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C
x2+y2=25
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D
x2+y2+6x+8y+25=0
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Solution
The correct option is Cx2+y2=25 Equation of circle with origin as centre : x2+y2=r2
Circle also passes through point (3,4) ∴32+42=25=r2
Hence, equation of circle is x2+y2=25.