Do you know the Golden Ratio in the Architectural Design ? And what is it ?

Phi (Φ), the Golden Section, has been used by mankind for centuries in architecture .
The golden ratio 1.61803 , also known as the divine proportion or golden mean, is a number often encountered when taking the ratios of distances in simple geometric figures such as the pentagon, pentagram, decagon and dodecahedron.
It is denoted phi, or sometimes tau.
The golden ratio used for example in : 1-the Great Pyramid of Giza 2-The Parthenon 3-Taj Mahal 4-Acropolis, Athens 5-Chartres Cathedral 6-Rose Window, Chartres Cathedral and etc

الرقم الذهبي معروف على الأرجح منذ عصور ما قبل التاريخ.
فقد استعمله مهندسون وفنانون كثر منذ العصور القديمة.
فهرم "خوفو"، المبني في سنة 2800 ق.م.
تقريبا، يظهر أن مهندسه استعمل الرقم الذهبي وكذلك شأن "البارثينون" بأثينا، الذي تم بناؤه في القرن الخامس ق.م وأيضا يوجدفى أهرامات الجيزة بمصر.
و في عصر النهضة، استعمل العديد من الرسّامين (مثل "بييرو ديلاّ فرانشيسكا" أو "ليوناردو دا فينشي") المظاهر الجمالية المرتبطة بالرقم الذهبي في لوحاتهم.
وقد أبرز "دا فينشي" كذلك كتابا يبيّن الخصائص الرياضية والجمالية والعجيبة للرقم الذهبي ويسمى هذا الكتاب " "De divina proportio(أو التناسب الإلهي) وقد ألفه كاهن إيطالي اسمه "فرا لوكا باشيولي".
و يظهر الرقم الذهبي كذلك في ميدان الموسيقى ذلك أن صانع الكمانات الإيطالي "أنتونيو ستراديفاري" (و اشتهر "ستراديفاريوس") استخدم هو الآخر هذا الرقم في صنع كماناته الشهيرة مع نهاية القرن السابع عشر للميلاد.

The famous Fibonacci sequence has captivated mathematicians, artists, designers, and scientists for centuries.
Also known as the Golden Ratio, its ubiquity and astounding functionality in nature suggests its importance as a fundamental characteristic of the Universe.
you can know more about it in this sites : http://io9.com/5985588/15-uncanny-examples-of-the-golden-ratio-in-nature http://en.wikipedia.org/wiki/Golden_ratio

Hello Ahmed, and thank you for your invitation.
Golden Ratio has been used since the golden days of ancient Greek Empire.
Golden ratio also known as phi is the ratio in which the sum of two quantities to the larger quantity is equal to the ratio of the larger quantity to the smaller one.* or 1.61803 It has been applicable in mathematics "geometry", architecture, arts "paintings and music".
Euclid was the first Greek mathematician to define the golden ratio in his well known book " Elements".
A famous " modern international style" architect, Le Corbusier used the golden ratio in his Modular system for the scale of architectural proportion.* Leonardo da Vinci's paintings also shows that he incorporated the golden ratio in them.
Finally, the French composer Erik Satie used the golden ratio in several of his pieces...
These are some of the famous names in various fields who used the golden ratio.
There are others, well known too.

Hello Ahmad , I often use it as a start point when I design products, inserts in tools, some sort of layouts ..etc.

I do this because I knowI will end up with appealing proportions some how :)