4 is the length of missing length of polygon.
What are Polygons?
Polygon, in geometry, any closed curve consisting of a set of line segments (sides) connected such that no two segments cross. The simplest polygons are triangles (three sides), quadrilaterals (four sides), and pentagons (five sides)
Similar polygons are two polygons with the same shape, but not the same size. Similar polygons have corresponding angles that are congruent, and corresponding sides that are proportional.
16/2=8
15.4/2=7.7
16/2=8
8/2=4
Hence, 4 is the length of missing length.
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