Penjelasan dengan langkah-langkah:
7x + 8 + 5x + 4 = 180
12x + 12 = 180
12x = 180 - 12
12x = 168
x = 168/12
x = 14
besar <ABC
= 7x + 8
= 7.14 + 8
= 98 + 8
= 106°
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Penjelasan dengan langkah-langkah:
7x + 8 + 5x + 4 = 180
12x + 12 = 180
12x = 180 - 12
12x = 168
x = 168/12
x = 14
besar <ABC
= 7x + 8
= 7.14 + 8
= 98 + 8
= 106°