คือโจทย์ที่ผมทำอยู่อาจารย์เป็นคนตั้งให้แต่คำนวณยังไงมันก็ไม่ลง 0 สักทีปวดหัวมากครับ

180(N-2) มี 5 หมุด
180(3) = 540 - 539 58 10 = 0 1 50 / 5
                                      = 22 ฟิลิปดา
                                      มุม Azimuth A ไปถึง B ที่โจทย์ให้มา 68 25 45

หมุด  มุมภายใน    ค่าปรับแก้    มุมที่แก้แล้ว         ความยาว   AB = 78.52      คำนวณมุม Azimuth AB = 68 25 45
     A    90 15 35        +22        90 15 57                        BC = 67.44                                 BC = 350 41 32
     B   102 15 25       +22       102 15 47                       CD = 45. 95                                CD = 269 23 39
     C    98 41 45        +22        98 42 07                        DE = 87 .42                                DE = 238 24 01
     D   149 00 00       +22       149 00 22                       EA = 98.38                                 EA = 158  9  48
     E     99 45 25       +22         99 45 57                  Total = 377.710
Total    539 58 10     +110       540 00 00

    Lat AB = 78.52 x cos 350 41 32    Dep AB = 78.52 x sin 350 41 32
              = 77.486                                     = - 12.700
         BC = 67.44 x cos 269 23 39           BC = 67.44 x sin 269 23 39
              = - 0.713                                     = - 67.436
         CD = 45.95 x cos 238 24 01           CD = 45.95 x sin 238 24 01
              = - 24.077                                    = - 39.137
         DE = 87.42 x cos 158   9 48           DE = 87.42 x sin 158 9 48
              = - 81.147                                    = 32.517
         EA = 98.38 x cos 68 25 45              EA = 98.38 x sin 68 25 45          
              = 36.170                                      = 91.490
        Total = 7.719                                        Total = 4.734

         ค่าปรับแก้ Lat AB = 7.719 x 78.52 / 377.710   Dep AB = 4.734 x 78.52 / 377.710
                                 = 1.605                                         = 0.984
                            BC = 7.719 x 67.44 / 377.710          BC = 4.734 x 67.44 / 377.710
                                 = 1.378                                         = 0.845
                            CD = 7.719 x 45.95 / 377.710          CD = 4.734 x 45.95 / 377.710
                                 = 0.939                                         = 0.576
                            DE = 7.719 x 87.42 / 377.710          DE =  4.734 x 87.42 / 377.710
                                 = 1.787                                         = 1.096
                            EA = 7.719 x 98.38 / 377.710           EA = 4.734 x 98.38 / 377.710
                                 = 2.010                                          = 1.233
                            Total = 7.719                                  Total 4.734

           Lat + AB 77.486 + 1.605   = 79.091             Dep - AB -12.700 - 0.984  = - 13.684
                   BC - 0.713 + 1.378   = 0.665                        BC - 67.436 - 0.845 = - 68.281
                   CD - 24.077 + 0.939 = - 23.138                    CD - 39.137 - 0.576 = -36.713
                   DE -81.147 + 1.787  = - 79.360                    DE 32 .517 - 1.096  = 31.421
                   EA 36.170 + 2.010   = 38.710                       EA 91.490 - 1.233   = 90.257
                                      Total = 15.968 ( อันนี้ไม่ได้ 0 )                      Total = 0 ( อันนี้ได้ 0 )

  ช่วยตรวจให้หน่อยครับมันผิดตรงไหนทำไมค่า Lat + ถึงไม่ได้ 0