Question

What is the value of $\bf{\theta$?​

Answer 1

Theta is a measure of the rate of decline in the value of an option due to the passage of time. It can also be referred to as an option's time decay. ... The conventional way to define the trig functions is to start with an acute angle that is an angle with measure \theta between 0 and 90 degrees.

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Answer 2

Theta refers to the rate of decline in the value of an option over time.

The sine of the angle θ is represented by the y-value of the point P on the unit circle. Thus, since sin θ = sin (180 − θ), we mark the two equal intervals in the graph. Hence, between 0° and 180°, the graph is symmetric about θ = 90°. Similarly, between 180° and 360°, the graph is symmetric about θ = 270°.