Triangles, squares and hexagons will tesselate with themselves. If you want to know why, calculate the angle measure for each of these shapes and you will see that each is a factor of 360. The same cannot be said for pentagons, heptagons, etc.
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five-sided polygons cannot tessellate
False
true
No because its angles are not factors of 360 degrees
A regular octagon will not tessellate - the 'spaces' left over are squares.