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http://i34.tinypic.com/33c7y1i.gifR^2+(R+1)^2 - 2R(R+1)cos(alpha)=4R^2+(R+1)^2 + 2R(R+1)cos(alpha)=92*R^2+2*R-11/2=0R=sqrt(3)-1/2
http://i34.tinypic.com/33c7y1i.gif
ReplyDeleteR^2+(R+1)^2 - 2R(R+1)cos(alpha)=4
R^2+(R+1)^2 + 2R(R+1)cos(alpha)=9
2*R^2+2*R-11/2=0
R=sqrt(3)-1/2