It is the total length "outline" of a figure. For example, the total length of the outline of a square, its perimeter, is the total length of the four sides of the square.
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circumference
Each side measures 10 cm
A perimeter is how far around something is like if you walked closely all the way around your home on the outside that is the perimeter.
If that's a quadrilateral, the area is 14 sq. m and the perimeter is 18 m.
Octagonal table means it has 8 sides. 8*0.67 = 5.36 metres