Triangles

  • Board Block for Two
    game

    Board block for two

    Age
    5 to 7
    Challenge level
    filled star empty star empty star

    Board Block game for two. Can you stop your partner from being able to make a shape on the board?

  • Triangle or No Triangle?
    problem

    Triangle or no triangle?

    Age
    5 to 7
    Challenge level
    filled star empty star empty star

    Here is a selection of different shapes. Can you work out which ones are triangles, and why?

  • Colouring Triangles
    problem

    Colouring triangles

    Age
    5 to 7
    Challenge level
    filled star filled star empty star

    Explore ways of colouring this set of triangles. Can you make symmetrical patterns?

  • Chain of Changes
    problem

    Chain of changes

    Age
    5 to 7
    Challenge level
    filled star filled star empty star

    In this activity, shapes can be arranged by changing either the colour or the shape each time. Can you find a way to do it?

  • Six to Four
    problem

    Six to four

    Age
    5 to 7
    Challenge level
    filled star filled star empty star
    Move four sticks so there are exactly four triangles.
  • Triangle Animals
    problem

    Triangle animals

    Age
    5 to 7
    Challenge level
    filled star filled star empty star

    How many different ways can you find to join three equilateral triangles together? Can you convince us that you have found them all?

  • Animated Triangles
    problem

    Animated triangles

    Age
    5 to 7
    Challenge level
    filled star filled star empty star
    Watch this "Notes on a Triangle" film. Can you recreate parts of the film using cut-out triangles?
  • Triangle Edges
    problem

    Triangle edges

    Age
    5 to 7
    Challenge level
    filled star filled star filled star
    How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?
  • Square split into a triangle and trapezium
    problem

    Tangram tangle

    Age
    5 to 7
    Challenge level
    filled star filled star filled star

    If you split the square into these two pieces, it is possible to fit the pieces together again to make a new shape. How many new shapes can you make?

  • problem

    Four triangles puzzle

    Age
    5 to 11
    Challenge level
    filled star empty star empty star

    Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?