# Chapter 10 - Geometry - 10.3 Polygons, Perimeter, and Tessellations - Exercise Set 10.3: 20

perimeter = 24 mm

#### Work Step by Step

RECALL: (1) The perimeter of a polygon is equal to the sum of the lengths of all its sides. (2) The sides of a regular polygon have equal lengths. This means that the five unknown side lengths of the regular hexagon are all $4$ mm. Add the lengths of all the sides to find the perimeter: perimeter = $4+4+4+4+4+4=24$ mm

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