tolong kak sekalian rumusnya

Garis dan Sudut

<ACD + <CBD + <BDC = 180°
92 + (180 - 7X) + (180 - 9X) = 180
92 + 180 - 7X + 180 - 9X = 180
452 - 16X = 180
-16X = 180 - 452
-16X = -272
X = 17

<CBD = 180° - <ABD
<CBD = 180° - 7X
<CBD = 180° - 7 x 17
<CBD = 180° - 119°
<CBD = 61° (C).

*semoga membantu. sukses selalu ^_^

180°=92°+(180°-7x°) + (180°-9x°)
88°=(180°-7x°)+(180°-9x°)
88°=360°-16x°
-272=-16x°
x=17
sudut CBD=180°-7x°
=180°-119°
=61° (c.)

sori klo slh