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Martin's Maths
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  • The Arts, Fun and Entertainment
    • The Arts, Fun and Entertainment (1)
      • Maths in the Movies
      • Bend your brain
      • Digits of π
      • Unsolved Problems
      • Unsolved Problems (2)
      • Maths Oddities
      • Recommended Reading
      • Maths in Everyday Life
      • Maths in Art
      • A Wacky Circle
      • Fun with a Mobius Strip
    • The Arts, Fun and Entertainment (2)
      • The Witch of Agnesi
      • Peaucellier's Linkage
    • External Sites
  • Puzzles and Problems
    • Three Short Sharp Problems
    • A Scary Sum
    • The "Impossible Problem"
    • Hard or Easy
    • An Area Problem
      • Area Problem Solution
    • A Challenge
      • A Little Challenge - Solution
    • More Puzzles and Problems
      • Two More Number Problems
      • Great Circle Routes
        • Great Circle Routes - the Maths
    • Easier than it looks!
  • What's Your Number?
    • Taxicab Numbers
      • Taxicab Numbers Explained
    • Deficient, Abundant and Perfect Numbers
      • Deficient Numbers
      • Abundant Numbers
      • Perfect Numbers
  • Proofs and Demonstrations
    • Pythagoras
    • Area of a Circle
    • Cosine Rule
    • Sine Rule
    • Pythagorean Triples
  • Unsung Heroes and Heroines
    • The Sieve of Eratosthenes
  • Mathematical Humour
    • The Simpsons
    • Calvin and Hobbes
  • Resources
    • Useful Links (Websites)
    • Useful Links (Software)
    • Useful Links (Apps)
  • About Me
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Martin's Maths

Proofs and Demonstrations

Pythagoras

Pythagorean Triples

Area of a circle

Sine Rule

Cosine Rule

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