Explaining, convincing and proving

  • Thousand Words
    problem

    Thousand Words

    Age
    16 to 18
    Challenge level
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    Here the diagram says it all. Can you find the diagram?

  • Cyclic Triangles
    problem

    Cyclic Triangles

    Age
    16 to 18
    Challenge level
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    Make and prove a conjecture about the cyclic quadrilateral inscribed in a circle of radius r that has the maximum perimeter and the maximum area.

  • Plus or Minus
    problem

    Plus or Minus

    Age
    16 to 18
    Challenge level
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    Make and prove a conjecture about the value of the product of the Fibonacci numbers $F_{n+1}F_{n-1}$.

  • Integral Inequality
    problem

    Integral Inequality

    Age
    16 to 18
    Challenge level
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    An inequality involving integrals of squares of functions.

  • Rarity
    problem

    Rarity

    Age
    16 to 18
    Challenge level
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    Show that it is rare for a ratio of ratios to be rational.

  • Road maker 2
    problem

    Road Maker 2

    Age
    16 to 18
    Challenge level
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    Can you work out where the blue-and-red brick roads end?

  • Transformations for 10
    problem

    Transformations for 10

    Age
    16 to 18
    Challenge level
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    Explore the properties of matrix transformations with these 10 questions.

  • Dodgy proofs
    problem

    Dodgy Proofs

    Age
    16 to 18
    Challenge level
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    These proofs are wrong. Can you see why?

  • Interpolating polynomials
    problem

    Interpolating Polynomials

    Age
    16 to 18
    Challenge level
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    Given a set of points (x,y) with distinct x values, find a polynomial that goes through all of them, then prove some results about the existence and uniqueness of these polynomials.