No, they will not fit together, you will also need a square with sides equal in length to the sides of the octagon.
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True
It is eight
Octagonoctagon
There are eight lines of symmetry.
13 sides: Triskaidecagon14 sides: Tetrakaidecagon15 sides: Pentakaidecagon16 sides: Hexakaidecagon17 sides: Heptakaidecagon18 sides: Octakaidecagon19 sides: Enneakaidecagon20 sides: Icosagon