比個ans我~maths~f.2
2007-06-17 4:17 am
1. If an exterior angle of a regular n-sided polygon is 72ﾟ , then the sum of its interior angles is?
回答 (2)
2007-06-17 7:52 am
✔ 最佳答案
先計佢有幾多條邊,除左圓形,所有形狀ge外角和都係360度,
而有幾多條邊就有幾多隻角,
,,,
所以 72n=360
n=5
...
一個形ge 內角和,等於(n-2)x180,,,原因為,,,你一定可以將個形cut 做n-3個三角形,,,
,,,
所以答案係,,,
(5-2)x180=540度
參考: 自己
2007-06-17 4:21 am
72n = 360 ( sun of ext. ∠ of polygon)
n = 5
Sun of interior angles : ( 5 - 2 ) X 180* ( ∠ sum of polygon )
= 540*
n = 5
Sun of interior angles : ( 5 - 2 ) X 180* ( ∠ sum of polygon )
= 540*
參考: My Maths Knowledge
收錄日期: 2021-04-13 00:59:38
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