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In a visual model, a small square of area s² is removed from a square of area r². The remaining L-shape is cut and rearranged into a rectangle. What are the sides of that rectangle?

Answer and explanation

Correct answer: r−s and r+s — r−s और r+s

The direct answer is A: the rectangle has sides r−s and r+s. The original square area is r² and the removed square area is s², so the remaining area is r²−s². The difference-of-squares identity says r²−s²=(r−s)(r+s). Cutting and rearranging does not change area; it only changes the shape of the L-shaped remainder. Therefore the rearranged rectangle must have one side r−s and the other side r+s. B would give area (r−s)², which is a different expression. C would give (r+s)² and would be larger than the original square in the usual positive-length setting. D gives area rs, not r²−s². Memory cue: difference of two squares becomes a rectangle whose sides are the difference and the sum.

Related tags

Difference Of SquaresVisual ProofRearrangementVisual Models Of IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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