Maths Olympiad Prep

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Problem 793

AMC 10/12, early questions
Geometry Difficulty 3.6 Find the answer HMMO · United States · 2020

Two hexagons are attached to form a new polygon PP. Compute the minimum number of sides that PP can have.

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A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.

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Official solution

Solution:

A triangle can be split into two hexagons; in other words, two concave hexagons can be attached to form a triangle, like the following:

Figure 1

Source: MathNet, licensed CC-BY-4.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.