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Answer 1 · 2015-12-16T00:15:33

#72# #units#

Perimeter is the sum of all sides.

Since octagon has #8# sides,

Then #P=8n#

#n = #length of the side; #n=9#

#P=8(9)#

#P=72#

Since there is no unit of measurement (#cm,# #m#), we will just use #u# or #unit#