Two congruent rectangles are placed side by side. Two line segments form two coloured quadrilaterals and three triangles. What is the proportion purple : green?
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Solution
Purple : green = 1.

Poem
It looks like a painting
The lights flow
Bright in the cathedral shining
The colours are igniting
From floor to ceiling
Merged with precious stones so interesting
Very fragile
Requires carefully cleaning
Stained glass in houses, churches or temples give a beautiful feeling
