# Trigonometry

### By: Pawan Singh

## My learning goals for the unit

-Understanding word problems.

## Summary of the unit

Terms

**Domain ** - The set of all possible inputs of a function.

**Function ** - An operation that assigns a correspondence from elements of one set to elements of another set.

**Period ** - The repeating interval of a periodic function; the period of a function is a real number.

**Periodic Function ** - A function that repeats itself in regular intervals; it follows this equation: *f* (*x* + *c*) = *f* (*x*) , where *c* is a constant.

**Range ** - The set of all possible outputs of a function.

**Reference Angle ** - The positive acute angle formed between the terminal side of an angle and the x-axis.

**Rule ** - The part of a function that dictates the exact correspondence between the elements of one set and the elements of another set.

**Trigonometric Functions ** - There are six trigonometric functions: Sine, cosine, tangent, cosecant, secant, and cotangent.

**Unit Circle ** - The circle whose center is at the origin and whose radius is one.

## Pictures

## Word Problem

Cos55 Degrees=X/20

20Cos55=X

X=11.5Ft