There is a polygon of the board, saw off a corner but vertex, forming a polygon angle sum of 3060 degrees, the original board is several sided
Let the number of sides of the new polygon be n, then
(N-2)×180°=3060°
N-2=17
N=19
When the original polygon saws off a corner but not a vertex, it has one more edge than the original polygon,
Then the number of sides of the original polygon is 19-1 = 18
A: the original board is octagonal
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