The sides of right-angled triangles are labelled opposite, hypotenuse and adjacent. Trigonometry explores the relationship between sides and angles in right-angled triangles. The hypotenuse is the ...

Using a unit circle can help develop a deeper understanding of trigonometry in right-angled triangles. In this maths lesson, students explore the behaviour of a radius vector as it rotates around a ...

The Doctrine of Triangles offers an interdisciplinary history of trigonometry that spans four centuries, starting in 1550 and concluding in the 1900s. Glen Van Brummelen tells the story of ...

An illustration of a magnifying glass. An illustration of a magnifying glass.

This takes students through six matching activities, three on finding sides and three on finding angles. Designed to create discussion and to be used as a starter/plenary but use how you wish. You'll ...

In the 1930s, a mathematician by the name of Nicolas Bourbaki was said to frequent the Café Capoulade in Paris, a haven for artists and intellectuals near Luxembourg Gardens. There he wrote an ...