The tangent of angle is a number which is defined by a ratio of legs, opposite and adjacent to this corner, in a triangle. Knowing only this ratio it is possible to find out corner size, for example, having used trigonometrical function, the return to a tangent - an arctangent.
Instruction
1. If you have near at hand Bradis's tables in a paper or electronic look, then definition of a corner will come down to search of value in the table of tangents. Corner size - that is that will be compared to it, as it is required to find.
2. If there are no tables, then it is necessary to calculate value of an arctangent. It is possible to use for this purpose, for example, the standard calculator from structure of Windows OS. Open the main menu, having clicked the Start-up button or having pressed the WIN key, pass into the section "All Programs", then into the subsection "Standard" and select the Calculator item. Same it is possible to make through dialogue of start of programs - press a combination of the keys WIN + R or choose the line "Execute" in the main menu, make the calc team and press the Enter key or click the OK button.
3. Switch the calculator to the mode which allows to calculate trigonometrical functions. For this purpose open the section "Look" in its menu and select the Engineering or Scientific item (depending on the version of the used operating system).
4. Enter the known value of a tangent. It can be done as from the keyboard, and clicking the necessary buttons of the interface of the calculator.
5. Make sure that in the field "Degrees" are costed by a mark to receive result of calculation in degrees, but not in radians or grads.
6. Give a mark in a checkbox with the inscription Inv - it you invert the values of the calculated functions designated on calculator buttons.
7. Click the button with the inscription tg (tangent) and the calculator will be calculated by value of inverse function to a tangent - an arctangent. It will also be a required corner.
8. All this can be done also with use of online calculators of trigonometrical functions. It is rather easy to find such services in the Internet by means of search engines. And some of searchers (for example, Google) have the built-in calculators.