Perhatikan gambar berikut! A.nilai x! B.besar sudutBOC

Pada saat berpelurus sudut total = 180°

3x+90+2x-10 = 180

5x + 80 = 180

5x = 100

x = 20°

Sudut BOC (2x-10)

= 2(20)-10

= 40-10

= 30°

Jawab:

a. 20

b. 30°

Penjelasan dengan langkah-langkah:

a. Nilai x

∠AOD + ∠COD + ∠BOC = 180°

3x° + 90° + (2x – 10)° = 180°

3x + 2x + 90 – 10 = 180

5x + 80 = 180

5x = 180 – 80

5x = 100

x = 100 : 5

x = 20

b. ∠BOC = (2x – 10)°

= ((2)(20) – 10)°

= (40 – 10)°

= 30°