In these lessons we will how to use the basic trigonometric ratios, expressed in the mnemonic SOH-CAH-TOA.

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Trigonometric Ratios

Trigonometry Word Problems

Lessons On Trigonometry

Trigonometry Worksheets

What is SOHCAHTOA and how to use the trig ratios to find missing sides and missing angles on right triangles?

The following diagram shows the SOHCAHTOA formula for sin, cos, and tan. Scroll down the page for more examples and solutions on SOHCAHTOA.

**What is SOH-CAH-TOA?**

SOHCAHTOA is a mnemonic to help us remember the trigonometric ratios.

Sine = Opposite/Hypotenuse (SOH)

Cosine = Adjacent/Hypotenuse (CAH)

Tangent = Opposite/Adjacent (TOA)

**What is Soh-Cah-Toa?**

Shows how to use Soh-Cah-Toa to determine which trig ratio to use.

**Basic Trigonometry Formula - SOH-CAH-TOA**

A basic introduction to defining the three major trigonometric functions (sine, cosine, tangent)
are discussed using the mnemonic SOH-CAH-TOA.

**Basic Trigonometry Review - SOH-CAH-TOA**

A review of basic trigonometry: Sine, Cosine & Tangent including how to use the ratios to find
missing sides and missing angles on right triangles.

**Sine Cosine Tangent - SOHCAHTOA**

Students learn that the sine of an angle of a right triangle is equal to the length of the side
opposite the angle over the length of the hypotenuse (SOH), the cosine of an angle of a right
triangle is equal to the length of the side adjacent to the angle over the length of the hypotenuse (CAH),
and the tangent of an angle of a right triangle is equal to the length of the side opposite the angle
over the length of the side adjacent to the angle (TOA).

Students are then asked to find the values of the sine, cosine, and tangent of given angles in given right triangles.

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