Q: What is the equation of a circle centered at the origin with a radius of 3?

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The equation is: x2+y2 = radius2

x2 + y2 = 49

x² + y² = 100.

x² + y² = 36.

x² + y² = 1.

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The radius of the circle decreases when you make the circle smaller.

The equation is: x2+y2 = radius2

x2 + y2 = 25

x2 + y2= 16

x2 + y2 = 25

x2 + y2 = 36

x2 + y2 = 49

x2 + y2 =144

x2 + y2 = 400

x² + y² = 225.

x² + y² = 64.

x² + y² = 100.