Add each side of the decagon, or all ten sides, to get the sum.
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1440
1440 degrees
The interior angles of a ten sided decagon add up to 1440 degrees
cmon decagon? 10 sides right? well here we go 180(10 - 2) 180(8) 1440 degrees there u go
The interior angles of a 12 sided dodecagon add up to 1800 degrees