Trigonometry (HSC SSCE Mathematics Advanced): Flashcards

A portion of a circle's circumference

Region bounded by two radii and the arc between them

$l = r heta$

rac{ heta}{360} imes 2pi r

A = rac{1}{2}r^2 heta

A = rac{ heta}{360} imes pi r^2

$P = ( heta + 2)r$

Arc length plus two radii

$pi$ radians

Shorter vs longer arc between two points