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20 1 1 Detailed explanation of Question 17 in the senior high school entrance examination in Tianjin.
Because everyone

inner angle

Both are 120, and we can construct a regular triangle to do it.

The regular triangle OPQ is formed by extending BA, EF and CD, and it is easy to get that the side length of the regular triangle is 8.

therefore

hexagon

The circumference of is 8×2+ 1-2= 15.

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