box b1 0 0 0 1 1 1 dset a30 atan2(1,2)*180/pi dset r sqrt(5) box b2 0 0.45 0 1/r r/2 1 trotate b2 0 0.45 0 0 0 1 a30-90 bop b1 b2 bopfuse result set square 6.27082