Smaw angle approximation is a wey o estimatin angles in radians, whaur the angle is smaw (less nor 3 or 4 degree).

Whan x is smaw, an in radians, the follaein formulae is true:

${\displaystyle \sin x\simeq x}$

${\displaystyle \cos x\simeq 1-\frac{x^2}{2}}$

${\displaystyle \tan x\simeq x}$