GATE 2021 CS (CS2) – Question 7
A jigsaw has two pieces. One is shown above the four candidate missing pieces. The pieces may be translated, rotated or flipped. Which missing piece forms a rectangle with the given piece?

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Correct answer: (A) Option A in the figure
Explanation
Trace the full stepped boundary of the supplied piece, including its narrow notches. Rotate the candidate boundary to face it and match protrusions to recesses in order. A supplies the complementary sequence and widths along the entire join, leaving a rectangular outside boundary. The other choices mismatch at least one step or notch.
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