Write the equation in standard form for the circle with radius 9 centered at the origin.
1 answer:
The standard form of the equation of a circle of radius r, with (assuming centre h, k) is given as: (X-h)^2 + (y-k)^2 = r^2 As we are required to write an equation in standard form for the circle with radius 9 centred at the origin. Centre(h,k)=(0,0), r=9 Substituting these values into the standard form of the equation of a circle given above: (X-0)^2 + (y-0)^2 = 9^2 X^2 + y^2 =81 The standard form is x^2 + y^2 =81 I’m pretty sure this is right
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