8. Parables

8.1 Layout by intermediate points

Data :

• width [AB] = l ;

• height [CD] = m.

Layout :

• divide [AB] into 4 equal parts ;

• divide [DC] into 4 equal parts and extend downwards by 1/4 m to point E ;

• Draw a parallel to [AB] through C, intersecting the second and fourth divisions of [AB] at points F and G ;

• Draw a parallel to [AB] passing through the last quarter of [CD], which determines points I and J by intersection with the second and fourth divisions of [AB] ;

• join [AF], [BG], [IE], [JG] ;

• ...