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Jumlah semua sudut adalah 360 derajat.
3x+40+110+ 90 = 360
3x + 240 = 360
3x = 360-240
3x = 120
x = 120/3 = 40
Maka x adalah 40 derajat
3. 6c+3c+6c = 360
15c = 360
c = 24 derajat
Nilai 3c = 3 x 24 = 72
Nilai 6c = 6 x 24 = 144
Sudut disebelah 6c juga 6c makanya bisa 6c+3c+6c = 360