Mohon dijawab ya teman temannn makasiiiiii​

Penjelasan dengan langkah-langkah:

180 = (6x+9)+(4x-19)

180 = 6x+4x+9-19

180 = 10x – 10

10x = 180+10

10x = 190

x = 190/10

x = 19

maka besar sudut CBD = (4(19)-19)

= 76-19

= 57°

Jawaban:

6x + 9 + 4x – 19 = 180

10x – 10 = 180

10x = 190

x = 19

CBD = 4x – 19

= 4(19) – 19

= 76 – 19 = 57 (C)