9 * 10.2 = 91.8 centimetres.
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It is the sum of the lengths of the nine sides of the nonagon.
A regular nonagon has 9 sides and so its perimeter is 9*40 = 36 units of measurement
add all the sides ???
The perimeter is just the total length of the sides so 5 x 6 = 30 inches.
The answer is 28 cm.