Report - S ˝˛˚ ˜ ! ˛ #$% n ˘ˇ ˆ˙ 1 2) C S = 180 ( n + 2) B S = 180 ( n - 2) A · 2000-03-26 · (1. 1: ˘&’ ( s ˝˛˚ ˜ ! ˛" #$% n ˘ˇ ˆ˙ s = 180 ×2 d s = 180 ( n ×2) c

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