S2-2.3-Ch2 與三角形及多邊形相關的角

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• D

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• A

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40.     正十一邊形的內角和

            = (11 – 2) x 180°

            = 1620°

            ∴     答案是C。

41.   若一個正多邊形的內角和是2340°，求該多邊形每個外角的大小。If the sum of interior angles of a regular polygon is 2340°, find the size of each exterior angle of the polygon.

       A.   24°

       B.    25°

       C.   26°

       D.   27°

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• D

Answer explanation