Decagon.
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A decagon
You only know that all ten interior angles of a 10-sided figure add up to 1,440 degrees.IF the 10-sided figure happens to be REGULAR, then each of them is 144 degrees.
Dodeca-, meaning 2+10, is used in describing any 12-sided figure thus dodecagon
Decagon.
A decihedron. Deci means 10.