Surface Area (Edexcel GCSE Maths): Flashcards

Total area of all outer surfaces of a 3D object

3D shape unfolded and laid out flat

Surface area of 3D shape = total area of its net

$4\pi r^2$

Radius

$\pi rl + \pi r^2$

Slant height

$2\pi rh + 2\pi r^2$

$2\pi rh$

Combined area of both circular ends

$2\pi r^2$

$3\pi r^2$