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4x - 4 + 2x + 7 =
6x + 3 =
6x =
6x =
2x =
2x =
sudut CBD = sudut BQR
= 2x + 7
=
=
13) sudut C = 180 - 80 (sepihak dalam)
=
sudut B = C = (sehadap)
sudut ABD = sudut B = (bertolak belakang)