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Continuing our exploration of the Golden Ratio of 1.618….., the children learned how to use a protractor to measure an obtuse angle of 137.5 degrees. We then discussed the difference between an obtuse angle (between 90 and 180 degrees), an acute angle (between 0 and 90 degrees) and a right angle (90 degrees).

Daniel Kahneman, as a psychologist, who won an economics Nobel Prize. In Thinking, Fast and Slow, Kahneman wrestles with flawed ideas about decision making.

Leonardo da Vinci said, “Man is the model of the world.” The Vitruvian Man by da Vinci is a study of the proportions present in the human body. The Golden Ratio or Divine Proportion is ubiquitous throughout the Vitruvian Man.

The Golden Ratio (also known as the Golden Mean  and the Divine Ratio), in my opinion is more significant that the otherwise known Most Important Number — Pi.

Fibonacci de Pisa was the most influential 12th century western mathematician. His father was an important Italian merchant or trader of goods. On a trip to Egypt around 1200AD, Fibonacci was introduced to Arabic numerals (0,1,2,3,4,5,6,7,8,9….) formerly unknown to Europe where the system of numbers were Roman (I,II,III,IV,V,VI,VII,VIII,IX,X…..).