Dickson Conner
02/27/2023 · Junior High School
Find the center and radius of the circle. \[ x^{2}+(y-8)^{2}=64 \] The center of the circle is \( (0,8) \). (Type an ordered pair.) The radius is \( \square \). (Simplify your answer. Type an exact answer, using radicals as needed.)
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Step-by-step Solution
To find the center and radius of the circle given by the equation
\[
x^{2}+(y-8)^{2}=64,
\]
we can compare this equation to the standard form of a circle's equation, which is
\[
(x - h)^{2} + (y - k)^{2} = r^{2},
\]
where \((h, k)\) is the center of the circle and \(r\) is the radius.
From the given equation:
- The term \(x^{2}\) indicates that \(h = 0\) (since there is no \((x - h)\) term).
- The term \((y - 8)^{2}\) indicates that \(k = 8\).
- The right side of the equation is \(64\), which represents \(r^{2}\).
Thus, we can identify:
- The center of the circle is \((h, k) = (0, 8)\).
- To find the radius \(r\), we take the square root of \(64\):
\[
r = \sqrt{64} = 8.
\]
So, the center of the circle is
\[
(0, 8)
\]
and the radius is
\[
8.
\]
In summary:
- The center of the circle is \((0, 8)\).
- The radius is \(8\).
Quick Answer
The center of the circle is \((0, 8)\) and the radius is \(8\).
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