This week, in the continuation of the topic of trigonometry, we learned new formulas and things about them. In this section, we learned how to use a calculator to calculate and find the sine, cosine, and tangent of numbers, and what are its different modes.

First, to use the calculator, we must make sure of the mode on it. Make sure the calculator is in Degree or Radian mode, depending on which unit your angle is in.

Sine calculation:
* Enter the angle number.
* Press the “sin” key.
* The result of the sine of the angle is displayed.
(This is the way for all of them sin,cos,tan)

This mode is used to find the external dimensions of the triangle and its sides.

In order to find the problems that ask us the angle and size inside the triangle, we have to use another solution that we use by writing the sine to the negative power of a product of the external numbers outside the triangle.

Example:

Consider a right triangle where one angle measures 30∘and the length of the adjacent side is 8 units. We want to find the length of the opposite side.