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UKMT Intermediate Mathematical Challenge, 2020

Geometry Difficulty 1.0 Junior Find the answer United Kingdom

Five congruent triangles, each of which is half a square, are placed together edge to edge in three different ways as shown to form shapes P, Q and R. Which of the following lists gives the shapes in ascending order of the lengths of their perimeters?

(A) P, Q, R (B) Q, P, R (C) R, Q, P (D) R, P, Q (E) P, R, Q

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