What is x^2+y^2-21=0 ?

The solution to x^2+y^2-21=0 is Circle with (a,b)=(0,0),r=sqrt(21)

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x^2+y^2-21=0

x^{2} + y^{2} - 21 = 0

(a, b) = (0, 0), r = 21

Solution steps

x^{2} + y^{2} - 21 = 0

Rewrite

x^{2} + y^{2} - 21 = 0

in the form of the standard circle equation

(x - 0)^{2} + (y - 0)^{2} = (21)^{2}

Therefore the circle properties are:

(a, b) = (0, 0), r = 21

What is x^2+y^2-21=0 ?
The solution to x^2+y^2-21=0 is Circle with (a,b)=(0,0),r=sqrt(21)