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What does the symbol theta stand for when, working out trigonometry?

By Lee Mansfield on the 11th of June, 2012

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    Theta (written as θ) is used to represent an angle. So, for example, a right angle would have θ=90.

    Theta is a letter of the Greek alphabet. (Long ago mathematicians ran out of English letters and so started using the Greek alphabet.)

    Refine By Chelsea Bunne on the 11th of June, 2012

Suggested reading…

Understand the graphs of trigonometric functions for angles of any size

Graphs and Trigonometry

We can plot graphs of the three trigonometric functions, Sin, Cos and Tan.

x axis gives the angle (Ao), the y axis gives the value for SinA/CosA/TanA

You read it like any other graph. 

Sin Graph

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Cos Graph

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Tan Graph 

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