# Leonardo Fibonacci

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• ﻿Leonardo Fibonacci was born in 1170 in Pisa, Italy, to Guglielmo Bonacci and Alessandra Bonacci. He traveled to Egypt, Syria, Greece, Sicily, and Providence to study numerical systems and methods of calculation.
• Greece has amazing number systems! I should write books about these!﻿
• ﻿Leonardo continued to study math, and wrote the book Liber Abaci. The first seven chapters focused on notation, which explained place value and the use of numerals in arithmetical equations. The rest of the book was about speculative mathematics such as proportion, the rule of false position, extraction of roots, properties of numbers, and geometry.﻿
• ﻿My new book is amazing. I wonder if this will give me any attention.
• Leonardo's book caught the attention of the Holy Roman Emperor, ﻿who summoned him and confronted him with a series of problems, all of which Fibonacci answered correctly.
• 1.3688081075.﻿
• What is x equal to if x3 ﻿+2x2 + 10x = 20?
• C﻿orrect! *Actual problem Fibonacci solved
• Leonardo then wrote a second book, Liber quadratorum, which was considered his masterpiece. Liber quadratorum, or "Book of Squares," was a compilation of theorems made by Fibonacci himself. His book included congruent numbers- numbers that give the same remainder when divided by a given number.
• My new  book on square numbers is considered my greatest work yet.﻿
• ﻿While both Liber abaci and Liber quadratorum were very influential, he is known today mainly for his discovery called the Fibonacci Sequence. The Fibonacci sequence was a series of numbers in which the next number is the sum of the previous two numbers. A scientist later discovered that these numbers were equal to the golden ratio. This golden ratio was then discovered to be everywhere in nature, from the spirals of sunflower heads and pine cones to the genealogy of the male bee and the spiral in snail shells.
• Look at all of these golden ratios!﻿
• The golden ratio is not just found in nature. It is also used today in architecture, film, photography, art, and even music. ﻿
• Isn't it crazy that this building was built using the Fibonacci Spiral?
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