Trigonometry Section 4.3 Right Triangle Trigonometry Special Right Triangles A unit circle has a radius of _____. The hypotenuse is _____ of a triangle. The hypotenuse of the triangles inside the unit circle has a length of _____. Special triangle 30-60-90 Special triangle 45-45-90 Fill in the unit circle. SOHCAHTOA SOHCAHTOA is an acronym to help us remember the right triangle definitions. S stands for _____. C stands for _____. T stands for _____. O stands for _____. A stands for _____. H stands for _____. Right Triangle Definitions of Trig Functions Therefore, SOH means _____. CAH means _____. TOA means _____. Adjacent and opposite are terms relative to the _____. Sine, cosine, and tangent are ratios of triangles. So why are sine and cosine always between -1 and 1? Evaluating Trig Functions Ex 1 Memorize all identities Reciprocal identities Quotient identities Pythagorean identities Ex 4 Ex 5 Ex 7 Homework Worksheets 3 & 4 1-60, Applications 61-66