( 1 - 1 . -6 ) 2 E a ) Find the length of AC . dian = (180) . XACBe = D A cosine rule AC ? = 23#+ 19 - 2x 23 x 19cos 58 AC 19 cm b) sinerule 23 23 cm 580 Sin A COD sin 58 b) Find the measure of the angle ACB But su AC from ( a ) sin . . 12, a) Convert -1200 to radians b ) Convert - to degrees . . sin 13. The temperature pattern (in Celsius) on a particular day is approximated by the function sin 0 = 1-3 C(t) = 20 - 16 sin ( (t -5) ) for 0 Ets 12, wheret represents the number of hours after midnight. (a) Sketch the graph of temperature versus time for 0 s t s 12 (b) Determine the time at which the minimum temperature occurs (c) Determine the time period for which the temperature was between 20 c and 25.C. (14. ) Find the area and arc length of the sector of the circle with radius 6 cm and angle radians