dari gambar berikut besar CBD tolong di jawab secepatnya pakai cara ya

<CAB + <ABC + <BCA = 180°
5x + 6x + 7x = 180
18x = 180
x = 10

<ABC = 6x = 6 * 10
<ABC = 60°

<ABC + <CBD = 180°
60 + <CBD = 180
<CBD = 180-60
<CBD = 120° (c)