The equation $x^2 + y^2 = 25$ represents:
Aellipse
Bcircle centred at origin, radius 25
Cparabola
Dcircle centred at origin, radius 5
Answer & Solution
Correct answer: D. circle centred at origin, radius 5
Compare to $x^2 + y^2 = r^2$: $r^2 = 25$, so $r = 5$, centre at origin.
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