- all builders, architects plan the positioning of objects using trigonometry
- engineers and scientists use graphs of trigonometric functions in astronomical analysis and positioning of planets and stars.
- It is widely applied in navigation and surveying.
Using trigonometry,we can calculate the lengths of the sides and angles of a right-angled triangle, provided ,one angle and the length of one side are given, or the lengths of two sides are known to us.
In a right triangle, the longest side, which is opposite to the right angle, is called the hypotenuse. The other sides are named depending on their position relating to the angle that is to be found.
If we name an angle in a right triangle as theta, which is other than the right angle, then the remaining two sides are called side opposite of theta and side adjacent to theta. In the following figures sides are named according to the angles of the triangle.
There are 6 T-Ratios (trigonometric ratios) (For figure 1)
Sin A = BC/AC
Cos A = BA/AC
Tan A = BC/BA
Sec A = AC/BA
CosecA = AC/BC
Cot A = BA/BC