{{ item.displayTitle }}

No history yet!

Student

Teacher

{{ item.displayTitle }}

{{ item.subject.displayTitle }}

{{ searchError }}

{{ courseTrack.displayTitle }} {{ statistics.percent }}% Sign in to view progress

{{ printedBook.courseTrack.name }} {{ printedBook.name }} The ratio between the lengths of the adjacent side and the hypotenuse in a right triangle for a specific angle, $θ,$ is called the cosine of $θ$ and is written as $cos(θ).$

$cos(θ)=hypotenuseadjacent $

The ratio is always the same for any given angle. If the hypotenuse is, for example, twice as long as the adjacent side, the ratio is $cos(θ)=21 .$ This quotient holds true because the triangles are bound by similarity. Cosine only states the **ratio** between the adjacent side and the hypotenuse, it gives no indication about the lengths of the individual sides.