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A square of side q is removed from a square of side p, and the remaining part is rearranged into a rectangle. What are the sides of the new rectangle?

Answer and explanation

Correct answer: p-q and p+q

The direct answer is A: the sides are p-q and p+q. The original square has area p², and the removed square has area q², so the remaining area is p²-q². Using the difference-of-squares identity, p²-q²=(p-q)(p+q). Thus the rearranged rectangle must have side lengths p-q and p+q. Option B gives the sides of the two original squares, but not the dimensions of the rearranged remaining region. Option C would give area (p+q)², which is too large because it includes more area than remains. Option D gives area (p-q)² and does not equal p²-q² in general. The visual rearrangement changes the shape but preserves area. Memory cue: difference of two square areas becomes a rectangle whose sides are the difference and the sum of the original side lengths.

Related tags

Difference Of SquaresRearrangementRectangle DimensionsVisual ProofVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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