How do you write the standard form of an equation with a center at (0, 0), radius 9?

1 Answer
Noah G
Mar 20, 2018

#x^2 + y^2 = 81#

Explanation:

The equation of a circle is

#(x - a)^2 + (y- b)^2 = r^2#

Where the centre is at #(a, b)# and the radius is #r#.

Therefore your circle will have equation

#x^2 + y^2 = 81#

Hopefully this helps!

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