The Six Trigonometric Ratios

This is the acute angle between the terminal side and the x-axis. It is always positive. It is indicated by the symbol theta “θ”.

• Reference Angle

• Opposite Side

• Adjacent Side

• Hypotenuse

The side next to the reference angle in a right triangle.

• Reference Angle

• Opposite Side

• Adjacent Side

• Hypotenuse

△GHJ is a right triangle. Identify its hypotenuse.

• g

• h

• j

△GHJ is a right triangle. Identify its reference angle.

• ∠G

• ∠J

• ∠H

△GHJ is a right triangle. Identify its adjacent side.

• g

• h

• j

△GHJ is a right triangle. Identify its opposite side.

• g

• h

• j

This is the mnemonic used for remembering equations in six trigonometric ratios.

• SAH-COA-TOH

• SOH-CAH-TOA

• SOA-COH-TAH

Which of the following is the equation in finding sin⁡θ? 

• sine

• cosine

• tangent