what is trigonometry
trigonometry is a very common branch of mathematics the word trigonometry means measurement of side of a triangle this branch of mathematics can be used to find the angle of a triangle knowing its side or to find the ratio of side of triangle knowing its angle
fact
- angle equals to Arc / radius its unit is radian
- Radian equals to 180 degree
- sin, cos ,tan, cot, sec , cosec 6 trigonometric ratio
- each ratio is written by its first small English later