Section: Unit 6 Lesson 1 Notes Objective: SWBAT define trig ratios and determine the sine, cosine, and tangent of an acute angle in a right triangle. Standards: HSG-SRT.C.8, HSG-SRT.C.6 Vocabulary A ratio of the lengths of the sides of a right triangle is called a ratio. - There are six trigonometric ratios. The three most common ones are: , and - The longest side of a right triangle is called the and it is always from the right angle. A angle is the angle that you use to determine the labels for the other two sides of the right triangle. The other two labels are and is a variable (and a greek symbol) that is used to represent an angle measure. **Make sure your calculator is in the right mode! Press MODE, select DEGREE. To quit, press 2ND and then MODE. Trigonometric Ratios Ratio Definition Picture Sine (sin) Cosine (cos) Tangent (tan) A good way to remember is