# Arc Tangent(atan) Calculator

### Arc Tangent(atan) Calculator

Calculated atan() of the number

### atan() function

Arc Tangent(atan) is the inverse function of Tangent (tan), which means that a==tan(atan(a)) for every value of 'a' that is within atan()'s range.

This is an online free atan calculator. You can calculate value of atan() trignometric function easily using this tool.

### Important Abbreviations to remember

• SOH: Opposite / Hypotenuse (Sine)
• CAH: Adjacent / Hypotenuse (Cosine)
• TOA: Opposite / Adjacent (Tangent)

### Understanding the Main Trigonometric Functions

In mathematics, the trigonometric functions (also called circular functions, angle functions or goniometric functions) are functions of an angle. They relate the angles of a triangle to the lengths of its sides. Degrees and Radians are units of measuring these angles. Degrees originated as an unit to measure how far constellations moved in a day (1 degree ~ 1 day of movement). Degrees measure angles by how far we tilted our heads(Observer's view point). Radians measure angles by distance traveled(Movers's view point).