Set squares are drawing instruments used to create vertical, horizontal, and diagonal lines as well as certain angles. They may be shaped as squares, Ls, or triangles, although in American usage set ...

But today we're sticking with squares and triangles. Look at how they get bigger and spot how the colours change. Can you spot how these patterns grow and make predictions about what comes next?

A square has four right angles (90 ... The diagonals are equal and split a rectangle into four isosceles triangles. The diagonals do not meet at right angles. Since each corner of a rectangle ...