Tolong jawab soal Dibawah ini dengan benar dan caranya no 8,9,10

8. cari google aja

9.
a. abd = 7/12 . 180° = 105
b. cbd = 5/12 . 180° = 75

10.
5x + 4x + 9 = 180°
9x = 171°
x = 19°
a. pqs = 5x = 5.19 = 95
b. rqs = 4x + 9 = 4.19 + 9 = 85