tolong bantu no 10-11

11. A sudut 3 dan 5

12. 4x+25+2x+35= 180
6x = 180 - 60
6x = 120
x = 20

4x + 25
4 . 20 + 25
= 80 + 25
= 105° (C)

semoga dpt mmbantu :)