80 mm, 8·10=80. shift+option+9=·
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The perimeter of a regular hexagon with a side length of 6.8mm is 40.8mm
It is: 8*36 = 288 mm
The perimeter of an octogon can be calculated by multiplying the length of one side by 8, so:Perimeter = side x 8 = 115 mm x 8 = 920 mm
If the perimeter of a square is 40 mm the area is: 100 mm2
Perimeter = 720 mm or 72 cm