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What is the equation for a circle?

Updated: 4/28/2022
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6y ago

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The equation for a circle of radius r and centre (h, k) is:

(x - h)² + (y - k)² = r²

If the centre is the origin, the centre point is (0, 0), thus h = k = 0, and this becomes:

x² + y² = r²

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6y ago
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8y ago

x squared + y squared = r squaredFor a circle centered at (a, b), the equation is:

(x - a) squared + (y - b) squared = r squared

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Q: What is the equation for a circle?
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If a circle is centered at the origin and the length of its radius is 6 What is the circle's equation?

The general equation of a circle is given by the formula(x - h)2 + (x - k)2 = r2, where (h, k) is the center of the circle, and r its radius.Since the center of the circle is (0, 0), the equation reduces tox2 + y2 = r2So that the equation of our circle is x2 + y2 = 36.


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The equation of the inner circle is x2 plus y2 equals 4 the radius of the outer circle is four times the radius of the inner circle write the equation of the outer circle?

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