the study of shape

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Regular Pentagons
& the Golden Ratio

All you need to know about Isosceles Triangles

List of polygons
Euler's Formula

The Circle (Simple Wiki).
Measurement of a Circle: a treatise of three propositions by Archimedes.
Equation of a Circle
More on Equation of a Circle
Even more on Equation of a Circle
Circle Theorems
Inscribed Angle Theorem
Intersecting Chords Theorem
If (x1,y1) and (x2,y2) are the co-ordinates of the end of the diameter of a circle, then (x-x1) (x-x2)+ (y-y1) (y-y2)=0
circle theorems

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