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Two angles of polygon are 120° and 90° and the rest are each 166°. Find the number of the sides
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120 + 90 + 166*(n-2) = 180*(n-2),
210 + 166n - 332 = 180n - 360,
238 = 14n,
N = 238/14 = 17 sides.
Answer. 17 sides.