Trigonometry is the branch of mathematics that deals with the relationship between the sides and angles of a triangle.
There are three sides of the triangle :- Base, Perpendicular, Hypotenuse
- Base: The side that is horizontal to the plane.
- Perpendicular: The side making an angle of 90 degree with the Base.
- Hypotenuse: The longest side of the triangle.
Also, θ is the angle made by Hypotenuse and Base.
sine of angle θ = sinθ = Perpendicular / Hypotenuse
cosine of angle θ = cosθ = Base / Hypotenuse
tangent of angle θ = tanθ = Perpendicular / Base
cotangent of angle θ = cotθ = Base / Perpendicular
cosecant of angle θ = cosecθ = Hypotenuse / Perpendicular
secant of angle θ = secθ = Hypotenuse / Base
Note :- sine, cosine, tangent, cotangent, cosecant, and secant are called Trigonometric Functions that defines the relationship between the sides and angles of the triangle.