来自唐增铭的问题
已知一个多边形的每一个内角都相等,它的一个内角与外角的比为3：2,求它的对角线的条数.等着急用回答好了加5分
已知一个多边形的每一个内角都相等,它的一个内角与外角的比为3：2,求它的对角线的条数.
等着急用回答好了加5分
1回答
2020-05-12 14:29
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陈俊风
一个内角和一个外角的比是3：2,可以算出一个内角的度数是180÷（3+2）×3=108°,所以边数是360÷（180－108）=5,这个多边形是正五边形,对角线条数就是5(5-3)/2=5条.
2020-05-12 14:30:24
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