Trigonometric Ratios and Functions

This video tutorial introduces the sine and cosine trigonometric ratios, explaining their definitions and how they relate to right-angle triangles. The acronym SOHCAHTOA is presented as a mnemonic to remember the relationships between the sides of a triangle and the trigonometric ratios. Two examples are provided: one for calculating the primary trigonometric ratios and another for finding an angle using the cosine ratio and inverse functions.

Which trigonometric ratios are introduced in this lesson?

• Secant and Cosecant

• Cosecant and Cotangent

• Tangent and Secant

• Sine and Cosine

What is the side opposite the right angle in a right triangle called?

• Adjacent

• Opposite

• Base

• Hypotenuse

How is the sine ratio defined?

• Adjacent over Hypotenuse

• Hypotenuse over Opposite

• Opposite over Hypotenuse

• Opposite over Adjacent

What is the abbreviation for the hypotenuse in trigonometric ratios?

• HYPH

• HYPS

• HYPOT

• HYP

What is the cosine ratio defined as?

• Hypotenuse over Adjacent

• Opposite over Adjacent

• Adjacent over Hypotenuse

• Opposite over Hypotenuse

What is the abbreviation for the opposite side in trigonometric ratios?

• OPH

• OPT

• OPS

• OPP

What is the primary trigonometric ratio that involves the opposite and adjacent sides?

• Secant

• Sine

• Cosine

• Tangent

What is the primary trigonometric ratio that involves the opposite and hypotenuse sides?

• Sine

• Cosine

• Tangent

• Secant

What is the primary trigonometric ratio that involves the adjacent and hypotenuse sides?

• Secant

• Tangent

• Cosine

• Sine

What is the cosine ratio defined as?

• Adjacent over Hypotenuse

• Opposite over Adjacent

• Opposite over Hypotenuse

• Hypotenuse over Adjacent