தொலெமியின் தேற்றம் (Tamil Wikipedia)

Analysis of information sources in references of the Wikipedia article "தொலெமியின் தேற்றம்" in Tamil language version.

refsWebsite

Global rank Tamil rank

6,602^nd place

2,315^th place

2,385^th place

1,900^th place

1^st place

low place

3,234^th place

18^th place

39^th place

clarku.edu (Global: 6,602^nd place; Tamil: 2,315^th place)

Proposition 8 in Book XIII of Euclid's Elements proves by similar triangles the same result: namely that length a (the side of the pentagon) divides length b (joining alternate vertices of the pentagon) in "mean and extreme ratio".
And in analogous fashion Proposition 9 in Book XIII of Euclid's Elements proves by similar triangles that length c (the side of the decagon) divides the radius in "mean and extreme ratio".

An interesting article on the construction of a regular pentagon and determination of side length can be found at the following reference [1]