nomer 23 tolong dong

nomer 23
dari gambar nampak jumlah ketiga sudut = 180°
(x+35)+(3x+5)+(2x+20) = 180
(x+3x+2x)+(35+5+20) = 180
6x + 60 = 180
6x = 180 - 60 = 120
x = 120/6 = 20
∠ABD = x+35 = 20+35 = 55
pelurus ∠ABD = 180 - 55 = 125° (jawaban: A)