In order to answer that question i must know the size of this said shape.
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The sum, of the number of sides, is seven!
That is a regular octogan (8 sided shape)
An 8 sided shape is an octagon
The sum of a 10 sided figure is 1440 To solve it or the sum of any other figure you do this... 180(n-2) n equals the number of sides the figure has 180(10-2) 180(8) 1440
1980 degrees