Jawab:
C. 74 derajat
Penjelasan dengan langkah-langkah:
Sudut C = Sudut B (umpamakan x)
Sudut A = Sudut B - 42 (x-42)
180 = x + x + x -42
180 = 3x - 42
180+42 = 3x
222 = 3x
x = 222/3 = 74 derajat
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Verified answer
Jawab:
C. 74 derajat
Penjelasan dengan langkah-langkah:
Sudut C = Sudut B (umpamakan x)
Sudut A = Sudut B - 42 (x-42)
180 = x + x + x -42
180 = 3x - 42
180+42 = 3x
222 = 3x
x = 222/3 = 74 derajat