Hi, 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. You then draw a right triangle having one angle with measure theta degrees and label the three sides.
Similarly, you may ask, what does Theta symbolize?
In ancient times, Tau was used as a symbol for life or resurrection, whereas the eighth letter of the Greek alphabet, theta, was considered the symbol of death.
What is the letter for Theta?
Theta (uppercase/lowercase Θ θ), is the letter that means "think" in phonetics and also, of the Greek alphabet, used to represent the "th" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 9. The Cyrillic letter Ѳ came from Theta.
What does the theta symbol mean in trigonometry?
To define the trigonometric functions of an angle theta assign one of the angles in a right triangle that value. The functions sine, cosine, and tangent can all be defined by using properties of a right triangle. A right triangle has one angle that is 90 degrees. The longest side of the triangle is the hypotenuse.