Jawab pls pakai cara

1.
a. 180-80-50 = 50
b. 180-90-45 = 45
c. 180-40-30 = 110

2.
a. 360-90-81-65 = 124
b. 360-61-106-73 = 120
c. 360-111-68-132 = 49
d.360-104-69-84 = 103

1a. 180 derajat = 80 + 50 +x = 130 +x
         x = 180-130 = 50
1b. 180 = 45 +90 + x=135 +x
       x = 180-135 = 45
1c. 180 = 30 + 40 + x = 70 +x
       x = 180-70 = 110
2a. 360 = 81 + 90 +65 +x
             = 236 + x
      x = 360-236=124
2b. 360 = 61 + 106 + 73 + x
              = 240 + x
       x = 360-240 = 120  
2c. 360 = 132 +111 + 68 + x
             = 311 + x
       x = 360 - 311 = 49
2d. 360 = 69 + 104 + 84 + x
             = 257 + x
      x = 360-257 = 103