## Trigonometric Ratio relationship between the measurement of the angles and the length of the side of the right triangle. These formulas relate lengths and areas of particular circles or triangles. On the next page you’ll find identities. The identities don’t refer to particular geometric figures but hold for all angles.

Trigonometry Formulas List

## Arc = rθ. Trigonometric Formulas – Right Angle

## The most important formulas for trigonometry are those for a right triangle. If θ is one of the acute angles in a triangle, then the sine of theta is the ratio of the opposite side to the hypotenuse, the cosine is the ratio of the adjacent side to the hypotenuse, and the tangent is the ratio of the opposite side to the adjacent side • ## cot θ = Base/Perpendicular ## Magical Hexagon for Trigonometry Identities  ### Clock Wise:- ### Counter clock Wise: ## Reciprocal Identities ## Signs of Trigonometric Ratios ## The co-function or periodic identities can also be represented in degrees as:

• sin(π/2−θ) = cosθ
• cos(π/2−θ) = sinθ
• tan(π/2−θ) = cotθ
• cot(π/2−θ) = tanθ
• sec(π/2−θ) = cosecθ
• cosec(π/2−θ) = secθ

## Values of Trigonometric Functions 