Question
Describe the graph of the circle whose equation is $x^2+y^2=4$ as a subset of $\mathbf{R} \times \mathbf{R}$.
Step 1
The given equation is \(x^2 + y^2 = 4\). This is in the standard form of a circle 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. Show more…
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