# Trigonometric -- Trigonometry -- Formulas

These are the Trigonometric Ratios Formulas Below "refer to Image A and B below for reference"

Sine of Angle A

These are the Ratios of sin A, spoken as the "sine of angle A. Refer to Image B below."

sin A = opposite side(a)/hypotenuse(c)

By dividing the hypotenuse(c) by the opposite side(a) you get the sine of angle A, refer to Image A and B.

Cosine of Angle A

These are the Ratios of cos A, spoken as the "cosine of angle A. Refer to Image B below."

cos A = adjacent side(b)/hypotenuse(c)

By dividing the hypotenuse(c) by the adjacent side(b) you get the cosine of angle A, refer to Image A and B.

Tangent of Angle A

These are the Ratios of tan A, spoken as the "tangent of angle A. Refer to Image B below."

tan A = opposite side(a)/adjacent side(b)

By dividing the adjacent side(b) by the opposite side(a) you get the tangent of angle A, refer to Image A and B.

These Ratios can be remembered easy by remembering SOH-CAH-TOA

S=O/H, C=A/H, T=O/A

Three More Commonly Used Trig Ratios

Cosecant of Angle A

These are the Ratios of csc A, spoken as the "Cosecant of angle A. Refer to Image A and B below."

csc A = hypotenuse(c)/opposite side(a)

By dividing the opposite side(a) by the hypotenuse(c) you get the cosecant of angle A, refer to Image A and B.

Secant of Angle A

These are the Ratios of sec A, spoken as the "secant of angle A. Refer to Image a and B below."

sec A = hypotenuse(c)/adjacent side(b)

By dividing the adjacent side(b) by the hypotenuse(c) you get the Secant of angle A, refer to Image A and B.

Cotangent of Angle A

These are the Ratios of cot A, spoken as the "cotangent of angle A. Refer to Image A and B below."

cot A = adjacent side(b)/opposite side(a)

By dividing the opposite side(a) by the adjacent side(b) you get the cotangent of angle A, refer to Image A and B.

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Image A -

Image B -