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x2 + y2 = 81

Q: Which equation describes the circle with radius 9 that is centered at the origin?

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The equation is: x2+y2 = radius2

The simplest formula, in polar coordinates, is r = 7.

x2 + y2 = r2

x2 + y2 = 49

Since the circle is centered at the origin, the equation of the circle is x2 + y2 = r2. So we have: x2 + y2 = (3/2)2 x2 + y2 = 9/4

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The equation is: x2+y2 = radius2

The simplest formula, in polar coordinates, is r = 7.

The equation of a circle centered at the origin is x2 + y2 = r2; in this case, x2 + y2 = 64.The equation of a circle centered at the origin is x2 + y2 = r2; in this case, x2 + y2 = 64.The equation of a circle centered at the origin is x2 + y2 = r2; in this case, x2 + y2 = 64.The equation of a circle centered at the origin is x2 + y2 = r2; in this case, x2 + y2 = 64.

x2 + y2 = r2

x2 + y2 = 25

x2 + y2= 16

x2 + y2 = 25

x2 + y2 = 36

x2 + y2 = 49

Since the circle is centered at the origin, the equation of the circle is x2 + y2 = r2. So we have: x2 + y2 = (3/2)2 x2 + y2 = 9/4

x2 + y2 =144

x2 + y2 = 400