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19x -10 = 180
19x = 190
x = 190/19 = 10°
Sudut1 = 4.10 = 40°
Sudut2 = 7.10 - 6 = 64°
Sudut3 = 8.10 - 4 = 76°
Semoga membantu, jadikan terbaik ya
19x -10 = 180
19x = 180 +10
19x = 190
x = 190/19
x = 10
besar 4x = 4.10 = 40 derajat
besar 7x-6 = 7.10 -6 = 64 derajat
besar 8x-4 = 8.10 -4 = 76 derajat