Quick Reference ~ A maths Dictionary for Kids by Jenny Eather Email jeather@iprimus.com.au A Maths Dictionary for Kids by Jenny Eather at www.amathsdictionaryforkids.com



• Phi is an irrational number expressed as

• some more symbols used for Phi are Φ, φ, or ϕ.
• Phi is also known as the golden mean, golden ratio or golden number.

golden ratio

•   two quantities are in the golden ratio if their ratio is the same as
the ratio of their sum to the larger of the two quantities.
golden ratio

golden shapes are based on the golden ratio

golden rectangle, golden triangle, golden rhombus and the golden spiral

golden shapes

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