Trigonometric Ratio

Lisää tämän kaltaisia

Basic geometry and polygons

luonut chomi go

Congruence, constructions and similarity

luonut Amanda Nickaboine

Measurements and Motion in Geometry

luonut Jodi Ward

Polygons

luonut Taylor Keyser

Trigonometric Ratio

The CAST rule

C Quadrant

cosθ and secθ will be positive

A Quadrant

All trigonometric ratios and their corresponding reciprocal functions are positive.

T Quadrant

tanθ and cotθ will be positive

S Quadrant

sinθ and cscθ will be positive.

The special triangles

How to sketch an angle

Terminal Arm: the ray the defines the end of the angle

Initial Arm: the ray that defines the beginning of the angle.

An example

tan(11π/6)= -tan(π/6)= -1/√3

sec (5π/4) = -sec(π/4)= -√2