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The graph y = √(25 − x^2) is the upper semicircle of which circle?

Answer and explanation

Correct answer: x^2 + y^2 = 25

The governing concept is the standard equation of a circle centered at the origin: x^2 + y^2 = r^2. Starting with y = √(25 − x^2), square both sides to obtain y^2 = 25 − x^2. Rearranging gives x^2 + y^2 = 25, so the radius is √25 = 5 and the center is (0, 0). The original square-root form also imposes y ≥ 0, because a principal square root is never negative. Therefore it represents only the upper semicircle of that circle, not the complete circle. Option A is correct. Option B would describe radius √5, not 5; option C is a straight line; and option D is a parabola. The domain is −5 ≤ x ≤ 5, consistent with this semicircle.

Related tags

GraphsCircleSquare-RootConic-SectionsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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