box b1 0 0 0 1 1 1
dset a30 atan2(1,2)*180/pi
dset r sqrt(5)*0.5
box b2 0 0.25 0 r r 1
trotate b2 0 0.25 0 0 0 1 a30

bop b1 b2
bopcut result

set square 4.80379