Texas Instruments TI-30X Teachers Guide - Page 14
Trig Functions - set of 10
UPC - 033317198726
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Trig Functions Overview Students practice solving sine, cosine, and tangent ratios, and solve problems involving trigonometric ratios. Introduction Introduce the trigonometric ratios to students. sin = opposite leg ¾ hypotenuse cos = adjacent leg ¾ hypotenuse tan = opposite leg ¾ adjacent leg Math Concepts • multiplication • division • trigonometric ratios Materials • TI-30X ÙS • pencil • student activity A 3 5 B C 4 1. Have students find the trigonometric ratios for the triangle using the above definitions. Round to the nearest hundredth if necessary. (Use % , for rounding.) a. sin C b. cos C c. tan C d. sin A e. cos A f. tan A 3 ¾ 5 = 0.60 4 ¾ 5 = 0.80 3 ¾ 4 = 0.75 4 ¾ 5 = 0.80 3 ¾ 5 = 0.60 4 ¾ 3 = 1.33 2. Have students find the value of each ratio using the TI-30X ÙS. Round to the nearest 10 thousandth. a. sin 71° b. tan 31° c. cos 25° 0.9455 0.6009 0.9063 3. Have students find the measure of each angle using the TI-30X ÙS. Round to the nearest degree. a. sin B = 0.4567 b. cos A = 0.6758 c. tan C = 5.83 27 degrees 47 degrees 80 degrees ³ To set 2 decimal places: 1. Press % ,. F0123456789 2. Press 2 to select 2 decimal places. ³ To find sin 71°: 1. Press >. sin( 2. Enter 71; press E