nomer 4 , plis jawab pin ,sama caranya yaa.trimakasih

Besar <C
180° = (5x + 30 + 2x + 20 + 6x)°
180° = 13x° + 50°
130° = 13x°
10 = x

Maka besar <C
= (2x + 20)°
= (2x10 + 20)°
= 20° + 20°
= 40° (D.)