Pythagoras' theorem and trigonometry

Last updated: 15/11/2023
Pythagoras' theorem and trigonometry
Main Subject
Key stage
Category
Maths: A-level pure maths resources
Resource type
Student activity

A pictorial explanation for A level students, showing Pythagoras leading to 3 related trigonometrical identities.

  • sinΒ²x + cosΒ²x ≑ 1
  • tanΒ²x + 1 ≑ secΒ²x
  • 1 + cotΒ²x ≑ cosecΒ²x

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