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Ratio
Golden Ratio
Fibonacci
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RatioRatio
• Ratio is a way of showing the connection between two or more numbers.
• A ratio can be written as a fraction, a decimal or as numbers with : between them.
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There are 30 students in a class; 18 are girls and 12 are boys.
Express this as a ratio.
• The ratio of girls to boys is: 18 : 12 or
• 3 : 2 (simplifying) or
• 1·5 (decimal)
32––• (fraction) or
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The Golden RatioThe Golden Ratio
• At least since the Renaissance, many artists and architects have proportioned their works to approximate the Golden Ratio, believing this proportion to be aesthetically pleasing.
• Leonardo da Vinci’s drawings of the human body emphasised its proportion.
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The Golden RatioThe Golden Ratio
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The Golden RatioThe Golden Ratio
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• This Golden Ratio has many unusual properties. We will take the number as 1·618.
• Remember, this is an approximation. The number is irrational.
The Golden RatioThe Golden Ratio
11·618–––––= 0·618
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FibonacciFibonacci
• Fibonacci, an Italian mathematician, developed a famous series in the thirteenth century.
• Start with 1, 1.• Every number is calculated by adding the two
previous numbers together.
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11235
8
Fibonacci SeriesFibonacci Series
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• Compute the ratio of Fibonacci numbers:
2 ÷ 1 =
3 ÷ 2 =
5 ÷ 3 =
8 ÷ 5 =
13 ÷ 8 =
21 ÷ 13 =
Golden RatioGolden Ratio
21·5
1·666…
1·6
1·625
1·615…
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Fibonacci in NatureFibonacci in Nature
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21
SpiralsSpirals
1 12 3
58
13
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SpiralsSpirals
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Golden Ratio in NatureGolden Ratio in Nature
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Great Wall of ChinaParthenon, Greece
Golden Ratio in ArchitectureGolden Ratio in Architecture
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