Draw graphs of the sine and modulus functions and explain the humps.

Which of these triangular jigsaws are impossible to finish?

Can you find the area of the central part of this shape? Can you do it in more than one way?

Can you work out the equations of the trig graphs I used to make my pattern?

A weekly challenge: these are shorter problems aimed at Post-16 students or enthusiastic younger students.

Trigonometry, circles and triangles combine in this short challenge.

A weekly challenge: these are shorter problems aimed at Post-16 students or enthusiastic younger students.

If I tell you two sides of a right-angled triangle, you can easily work out the third. But what if the angle between the two sides is not a right angle?