Kak bantu aku kak please……​

Jawaban:

No 1

∠a + 130 = 180

∠a = 180 – 130

∠a = 50°

No 2

40 + 2a = 180

2a = 180 – 40

2a = 140

a = ¹⁴⁰/₂

a = 70

Nilai a = 70

∠BOC = 2a

∠BOC = 2(70)

∠BOC = 140°

Besar ∠BOC adalah 140°