Question

Tolong di bantu ya kak​

Answer 1

Penjelasan dengan langkah-langkah:

SUDUT dalam LINGKARAN

OA = OB = OC = jari²

sehingga,

∆ AOB = ∆ BOC = ∆ COA = ∆ sama kaki

besar sudut :

a. OCB = 180° – 120°

2

OCB = 60°

2

OCB = 30°

b. OBC = OCB

OBC = 30°

c. COA = 180° – 2 × 35°

COA = 180° – 70°

COA = 110°

d. OAC = OCA

OAC = 35°

e. AOB = 360° – 120° – 110°

AOB = 360° – 230°

AOB = 130°