To draw direct b and note on it three points And, In and With through these points give direct parallel perpendicular to direct b to a prstoyroyta on these straight lines parallel pieces

8
Draw at first b lengthways, then on this piece draw three A B C lines vertically of Answer A║B B║C b⊥A b⊥B b⊥C P.S wanted to load the picture, but I do not turn out, hope understoodly explained
37
Answer add