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Basic Formulas of Trigonometry.

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

  1. Base: The side that is horizontal to the plane.
  2. Perpendicular: The side making an angle of 90 degree with the Base.
  3. Hypotenuse: The longest side of the triangle.

 

Also, θ is the angle made by Hypotenuse and Base.

Then,

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.

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