Theta Symbol (θ)

The Greek letter (theta) is used in mathematics as a variable to represent a measured angle. For example, the symbol theta appears in the three main trigonometric functions: sine, cosine, and tangent as the input variable.

In plain language, this represents the cosine function which takes in one argument represented by the variable .

Symbol Format Data
θ Unicode
952
TeX
\theta
SVG

Usage

Cosine Function

The cosine function returns the cosine of an angle provided in radians. In geometric terms, the function returns the ratio of the right-triangle's adjacent side over its hypotenuse.

Sine Function

The sine function returns the sine of a number provided in radians. In geometric terms, the function returns the vertical component of the point formed by the angle on the unit circle.

Tangent Function

Given the angle of a right triangle as input returns the ratio of the triangle's opposite side over its adjacent side.

Related Symbols

capital theta

The capital Greek letter Θ (capital theta).