APFIVE Standard Equation of a Circle
Which of the following best describes the graph of the equation $$x^2 + y^2 = 16$$?
A
A parabola opening upward
B
A hyperbola with asymptotes y = x and y = -x
C
A circle with center at (0, 0) and radius 4
D
An ellipse centered at (0, 0) with semi-axes 4 and 4
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