yg no 8 nya saja pakai cara

Nomor 1 = 95°
Nomor 2 = 110°
Nomor 6 = 110+x=180
x=180-110=70°
Nomor 5 = 1 = 95°
Nomor 3 = 70°+95°+x=180°
x=180-165
x=15°