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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 P. Compute the minimum number of sides that P can have.

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:

Source: MathNet,
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