正多角形の対角線の交点の数・分割領域数

R_2(n) は領域の数を a_m(n) で表したもの。値は R(n) と一致する

表达式18: "R" Subscript, 2 , Baseline left parenthesis, "n" , right parenthesis equals 1 plus StartFraction, "n" left parenthesis, "n" minus 3 , right parenthesis Over 2 , EndFraction plus left parenthesis, StartFraction, "n" Over 2 , EndFraction minus 1 , right parenthesis "d" left parenthesis, 2 , "n" , right parenthesis plus "a" Subscript, 2 , Baseline left parenthesis, "n" , right parenthesis plus 2 "a" Subscript, 3 , Baseline left parenthesis, "n" , right parenthesis plus 3 "a" Subscript, 4 , Baseline left parenthesis, "n" , right parenthesis plus 4 "a" Subscript, 5 , Baseline left parenthesis, "n" , right parenthesis plus 5 "a" Subscript, 6 , Baseline left parenthesis, "n" , right parenthesis plus 6 "a" Subscript, 7 , Baseline left parenthesis, "n" , right parenthesis

正N角形の"N"

表达式20: "N" equals 30

uを動かすと対角線をランダムに少しずつ引く

表达式22: "u" equals 1

一覧表　table

2対角線の交点[N=30]

3対角線の交点[N=30]

4対角線の交点[N=30]

5対角線の交点[N=30]

6対角線の交点[N=30]

7対角線の交点[N=30]

正N角形

対角線・対角線の交点

表达式90:

made by @apu_yokai

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