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What is the equation of the circle with the center at the origin and with a radius of 9?

a.)x^2 + y^2 = 81
b.)(x - 1)^2 + (y - 1)^2 = 18
c.)x^2 + y^2 = 18
I'm pretty sure the answer is: x^2 + y^2 = 81

3 answers

You are right

Thanks:)

What if the 9 was 6?

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