More Lessons for Grade 9
Examples, videos, worksheets, solutions, and activities to help students learn 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.
Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.
You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.