1. Review of Trig Ratios 1. Review Triangle Key Terms A right triangle is any triangle with a right angle The longest and diagonal side is the hypotenuse The other two sides are the opposite side and adjacent side (means next to) The labels depend on the reference angle

2. Review of Trig Ratios 1. Identifying Sides of Right Triangle for a Reference Angle Ex 1: Reference Angle A; Identify the Sides (I DO) ABC Reference Angle: A Hypotenuse: Adjacent Side: Opposite Side: Hypotenuse Opposite Adjacent AB AC BC Ex 2: Reference Angle B; Identify the Sides (WE DO) ABC Reference Angle: B Hypotenuse: Adjacent Side: Opposite Side: Hypotenuse Adjacent Opposite AB AC BC

3. Review of Trig Ratios 2. Finding the Value of Trigonometric Ratios There are three main Trigonometric Ratios SINE of an ANGLE = __OPPOSITE__ HYPOTENUSE COSINE of an ANGLE = ADJACENT__ HYPOTENUSE TANGENT of an ANGLE = __OPPOSITE__ ADJACENT Remember, SOH – CAH – TOA

4. Review of Trig Ratios Ex 3: Find the Value of Sin A (I DO) ABC Reference Angle: A Opposite=4;Hypotenuse=5 Sin A = Opp = 4 = 0.80 Hyp 5 Sin A = 0.80 5 4 3 2. Finding the Value of Trigonometric Ratios Hyp. Opp Adj Ex 4: Find the Value of Cos A (WE DO) ABC Reference Angle: A Adjacent; 3Hypotenuse=5 Cos A = Adj = 3 = 0.60 Hyp 5 Cos A = 0.60 5 4 3 Hyp. Opp Adj FIRST, LABEL ALL SIDES! SOH CAH TOA

5. Review of Trig Ratios Ex 3: Find the Value of Cos B (WE DO) ABC Reference Angle: B Opposite=4;Hypotenuse=5 Cos B = Adj = 4 = 0.80 Hyp 5 Cos B = 0.80 5 4 3 2. Finding the Value of Trigonometric Ratios FIRST, LABEL ALL SIDES! SOH CAH TOA Hyp. Adj Opp Ex 4: Find the Value of Tan B (WE DO) ABC Reference Angle: B Opposite=3;Adjacent=4 Tan B = Opp = 3 = 0.75 Adj 4 Tan B = 0.75 5 4 3 Hyp. Adj Opp