24/05/01 15:04:48.18 AD3i5GdB.net
>>692
重心間の距離
x = R･{[cos(π/7)+sin(π/7)][2cos(π/7)-1]－1}/{2cos(2π/7)[1+2sin(π/7)]}
= 0.030256170633 R
cos(π/7)－cos(2π/7)－cos(4π/7) = 1/2,
－sin(π/7) + sin(2π/7) + sin(4π/7) = (1/2)√7,
24/05/01 15:04:48.18 AD3i5GdB.net
>>692
重心間の距離
x = R･{[cos(π/7)+sin(π/7)][2cos(π/7)-1]－1}/{2cos(2π/7)[1+2sin(π/7)]}
= 0.030256170633 R
cos(π/7)－cos(2π/7)－cos(4π/7) = 1/2,
－sin(π/7) + sin(2π/7) + sin(4π/7) = (1/2)√7,