jawab tolong yang diatas

a.
[tex]4x + 8x + 6x = 180 \\ 18x = 180 \\ x = \frac{180}{18} \\ x = 10[/tex]
b.
<ABE = 4 x 10 = 40°
<EBD = 8 x 10 = 80°
<CBD = 6 x 10 = 60°

c.
pelurus CBD = 4x + 8x = 12x = 12 x 10 = 120°