3D Trigonometry (Edexcel GCSE Maths): Quizzes

Visualising and identifying triangles

Create a right-angled triangle

Draw a 2D sketch with marked lengths

Use trigonometry to find the angle

When you know 2 sides and angle between

$a^2 + b^2 = c^2$

$a^2 = b^2 + c^2 - 2bc \cos A$

$\sin \theta = \frac{\text{opposite}}{\text{hypotenuse}}$

$\tan \theta = \frac{\text{opposite}}{\text{adjacent}}$

$d = \sqrt{l^2 + w^2 + h^2}$

It uses the same fundamental rules

They have regular structure