T i p s & T r i c k s t o o t h i c G e o m e t r y
Tips & Tricks to Gothic: Trefoil  Ogee Arch  Equilateral Arch  Rose Window

An instantly recognizable feature of Gothic is the stonework tracery that decorates fan vaulting, rose windows, arcaded cloisters, to simple windows and doorways. Many of the following shapes morph and grow from an interesting variety of other shapes  including triangles, pentagons, hexagons, circles, or circles within circles. The trefoil or trifoil begins with a simple equilateral triangle:
Set out an equilateral triangle (to find out how, click here). Measure half the length between AC to find point D. Now measure half the length of line BC to find point E. Draw a line from points D B and EA, to find center, F. 



. Now use centers
A, B and C to form the three arcs. 


Continue around until the design is complete.


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