Well, isn't that just a happy little question! An 87-sided polygon is called an octacontaheptagon. Just imagine all those lovely angles and sides coming together in perfect harmony on your canvas of geometry. Remember, there are no mistakes in math, just happy little miscalculations waiting to be corrected.
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An 87-sided polygon is called an octacontaheptagon. The prefix "octaconta-" indicates that it has 80 sides, and the suffix "-heptagon" indicates that it is a polygon with 7 sides. Therefore, combining the two prefixes gives us the name "octacontaheptagon" for an 87-sided polygon.
It's quite acceptable to call it an 87-agon but what's more important is knowing how to work out its properties
Octacontakaiheptagon i think
The name of a 12 sided polygon is Dodecagon.
A 8 sided polygon is called a octagon.
The name of a 9 sided polygon is Nonagon.
The name of a 19 sided polygon is enneadecagon.