已知圆上任意三点求圆心坐标及半径程序:程序名自设定 Lbi 0:{A,B,D,E,F,G }
A “X1”:B“Y1”:D“X2”:E“Y2”:F“X3”:G“Y3” I=0:J=0
Poi((A-F),B-G))
J ≥0=>H=J⊿
J ≤0=>H=J+360⊿
Poi((A-D),B-E))
J ≥0=>K=J⊿
J ≤0=>K=J+360⊿
L=((B+G)/2+(A+D)/2/Cos(H+90)*Sin(H+90)-(A+F)/2/Cos(H+90)*Sin(H+90)-(B+E)/2)/(Sin(K-90)-Cos(K-90)*Sin(H+90)/Cos(H+90))
“X ”:X=(A+D)/2+LCos(K-90) ▲
“Y ”:Y=(B+E)/2+LSin(K-90) ▲
“R ”:R=√(X-A)+(Y-B) ▲ (根号)
Goto 0
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