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several squares and regular pentagons 2021 Malaysia IMONST 1 Senior P1

Source:

September 21, 2021
geometrySquarespentagons

Problem Statement

Dinesh has several squares and regular pentagons, all with side length 1 1. He wants to arrange the shapes alternately to form a closed loop (see diagram). How many pentagons would Dinesh need to do so? https://cdn.artofproblemsolving.com/attachments/8/9/6345d7150298fe26cfcfba554656804ed25a6d.jpg