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jumlah sudut dab dan abc = 180 derajat
2x + 3x =180
5x=180
x=36
bcd=2x=2X36=72
sudut BAD+sudut ABC=180 derajat
2x+3x=180
5x=180
x=36
sudut BCD=sudutBAD
=2x
=2.36
=72