Question

1.Besar sudut CBD adalah?
2.Besar a adalah?
tolongg dong:(​

Answer 1

Jawaban:

Nomor 1.

ABD + CBD = 180°

(5a + 4)° + (7a + 8)° = 180°

5a + 7a + 4° + 8° = 180°

12a + 12° = 180°

12a = 180° - 12°

12a = 168°

a = 168°/12

a = 14°

Besar sudut CBD

CBD = (7a + 8)°

= (7(14) + 8)°

= (98 + 8)°

= 106°

.

Nomor 2.

3a° + 2a° = 180°

3a° + 2a° = 180°

5a° = 180°

a° = 180°/5°

a° = 36°

Nilai a adalah 36°