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5x = 180-5
x = 175/5 = 35 derajat
Sudut BFC = 2x
2 (35) = A. 70 derajat
28) 4x + 18 + 2x = 180 derajat
6x = 180-18
x = 162/6 = 27 derajat
Sudut PQR = 4x + 18
= 4(27) + 18
= 108 + 18
' = B. 125