The interior angles of a polygon form an arithmetic sequence. The difference between the largest angle and smallest angle is $56^\circ$. If the polygon has $3$ sides, then find the smallest angle, in degrees.
n + n + d + n + 2d = 180
3n + 3d = 180
n + d = 60
n = 60 - d
( n + 2d) - n = 56
2d = 56
d = 28
n = 60 - 28 = 32°
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