Trigonometric Ratios and Formulas

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What is the sine ratio in a right triangle?

The sine of an angle is the length of the opposite side divided by the length of the hypotenuse.

How is cosine defined in a right triangle?

Cosine is the length of the adjacent side divided by the hypotenuse.

Define the tangent ratio in a right triangle.

Tangent is the length of the opposite side divided by the adjacent side.

State the Pythagorean identity.

The Pythagorean identity is sin²θ + cos²θ = 1.

What is the formula for finding an angle using the tangent function?

The formula is tan⁻¹(opposite/adjacent).

What is the reciprocal of sine called?

The reciprocal of sine is called cosecant.