Disk 4                          Chapter 13                               Exercise #23

Trig:                 Sin Ө =opposite

                                    hypotenuse

                        Cos Ө = adjacent

                                    hypotenuse

                        Tan Ө = opposite

                                       adjacent

Use proportions to help solve

Problem 19      Cos angle = .9659

                        A =

H = 20                         *Do not round decimals, just type in the same number of places asked for.

Problem 25      Cos Angle=.5096

                        A = 422

                        H =

Problem 27      Use .7071 and round to the nearest degree

Problem 29      Round to the nearest degree

Problem 30      Do not round.

Problem 32      Round to the nearest degree

Problem 33      Round to the nearest degree

Problem 34      Round to the nearest degree

Problem 35      OPP                                         ANGLE                                   SIN

                        Use Pythagorean Thm.  Use Hyp and Adj         Sin of Angle

                        =                                              cosӨ= adj/hyp=7/10=> Use sin Ө = opp/hyp

Problem 36      ADJ                                         ANGLE                                   SIN

                        Use Pyth Thm =                       Use opp and hyp                      opp/hyp =

                                                                        Sin Ө = opp/hyp

                                                                        Ө =

Problem 37      HYP                                        ANGLE                                   SIN

                        Use Pyth Thm. =                      Use Tan Ө = opp/adj           Sin Ө = opp/hyp

Ө =                                          = 22/hyp

 Don’t round

Problem 38      1) Do Sin First             -------------------à

HYP                                        ADJ                                         SIN

114.79 Round                          Use Pyth Thm.              Sin 22 = .3746

use this for hyp

                        Sin 22 = opp/hyp

                        Use proportions to solve for hypotenuse

Problem 39      3) ADJ                                     2) OPP                                                1) SIN .6820

Use Pyth. Thm.                         Sin Ө = opp/hyp                       Do Sin first,                                                                  round

                        Round correctly                                                                        correctly 4                                2 decimal places                                                               decimals                                              

Problem 40      2) HYP                                    OPP                                         1) ANGLE

                        Use cosine and angle                Use Sin Ө = opp/hyp                Sin Ө = .8387

                        Cos Ө = adj/hyp

                        Round Correctly 1 decimal

Problem 42      Find hypotenuse, Round 2 decimals, then use hypotenuse to find cos Ө.  Round correctly 4 decimals.

Problem 43      They want the angle = Ө =          degrees.  Use sin Ө = opp/hyp, round to nearest degree.

Problem 44      Find the angle using Tan.  They want opposite =                   miles

                                       29

                          x

                                            Ө             Find x miles

Problem 46      Round 1 decimal correctly

Problem 47      Use Tan Ө = opp/adj to find Ө then calculate cos Ө.  Round 4 decimals correctly.

Problem 50      Round correctly 2 decimal places.