3D trigonometry (OCR GCSE Maths): Flashcards

Break into simpler 2D problems with right-angled triangles

Pythagoras' Theorem, Sin, Cos, Tan

Spotting where the right-angled triangles are in 3D shape

Draw it out flat to reduce to 2D

Hypotenuse ($H$), Opposite ($O$), Adjacent ($A$)

Pythagoras' Theorem

Sin, Cos, Tan ratios

$a^2 + b^2 = c^2$ where $c$ is hypotenuse

$\tan(\theta) = \frac{\text{Opposite}}{\text{Adjacent}}$

Project the relevant triangle onto a flat plane