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3x = 180
x =
x = 60
Sudut ABC = 60
Sudut CBD = 2x = 2(60) = 120
2. 2y + 7y = 180
9y = 180
y =
y = 20
Sudut RQS = 2y = 2(20) = 40
Sudut RQP = 7y = 7(20) = 140
3. 3x + 7x = 180
10x = 180
x =
x = 18
Sudut KLN = 3x = 3(18) = 54
Sudut NLM = 7x = 7(18) = 126