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Geometry Difficulty 2.0 Junior Find the answer United Kingdom

A square of paper is cut into two pieces by a single straight cut. Which of the following shapes cannot be the shape of either piece?

(A) An isosceles triangle (B) A right-angled triangle (C) A pentagon (D) A rectangle (E) A square

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Source: UK Mathematics Trust, licensed © UK Mathematics Trust; past papers published free at ukmt.org.uk. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.