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Penjelasan dengan langkah-langkah:
11. c
< AOD = < BOC
4x - 7 = 3x + 11
4x - 3x = 7 + 11
x = 18
< AOB = 180° - < AOD
< AOB = 180° - (4x - 7)
< AOB = 180° - (4.18 - 7)
< AOB = 180° - (72 - 7)
< AOB = 180° - 65°
< AOB = 115°
12. c
2a - 6 = 40 (bertolak belakang)
2a = 46
a = 23
3b + 14 + 112 = 180
3b = 180 - 126
b = 54/3
b = 18
3c + 3b+14 + 40 = 180
3c + 3(18) = 180 - 54
3c = 126 - 54
3c = 72
c = 24
2d+32 + 3c = 180
2d + 32 + 72 = 180
2d = 180 - 104
2d = 76
d = 38
====> a+b+c-d = 23+18+24-38
====> a+b+c-d = 41 - 14
====> a+b+c-d = 27
[answer.2.content]
