An octagon has eight sides, so add up all the sides... 8 x 10cm = 80 cm
Providing that it is a regular octagon with 8 equals sides then its perimeter is 8 time 8 = 64 cm
The perimeter is 8*505 = 44 cm.
pentagon
Perimeter = 8*7 = 56 cm
It is: 8*2.5 = 20 cm
Providing that it is a regular octagon with 8 equals sides then its perimeter is 8 time 8 = 64 cm
32cm.
The perimeter is 8*505 = 44 cm.
Perimeter = 8*5.5 = 44 cm
pentagon
Octagon: 8 sides; each side 12 cm; 12 x 8 = 96 cm
Perimeter = 8*7 = 56 cm
Perimeter = 8*15 = 120 cm
It is: 8*2.5 = 20 cm
It is: 8*4.6 = 36.8 cm
It is: 8*4 = 32 cm
we make the assumption that all sides are equal length, that is to say it is a regular octagon. Then one side has length 12 if 2 sides have length 23. So the perimeter is 8x12=96 cm