Girih designs

Students of 3rd of ESO have designed some ornamental drawings inspired in "girih" designs. Girih is an ancient art that comes from Islamic Culture and is based in interlaced lines that usually form star shapes and other regular or irregular polygons. It appears in different crafts such as plaster, inlay, coffered ceilings, tiles or latticeworks.

Coffered Ceiling from
Aljaifería, Zaragoza

Tile decoration from Necropolis of 
Shah-i-Zinda, Samamarcanda

Lattice from Mosque of Cordoba

Ceramic tessellations in Alhambra, Granada



Pictures source: Wikipedia

Modern Girih decoration of a door (Cajasur, Cordoba)

Colours are inspired in these techniques.

Moreover, here you are some exercises from 4º of ESO.

Six tangent circumferences inside a pentagon.

Thales' Theorem

Dividing a segment into equal parts.

If you don't want to draw parallel lines by using set-squares you can use this method.

Drawing a regular pentagon by knowing one of its sides