tolong dijawab yaa yang nomor 4, a Dan b.

semoga bermanfaat ya..!!!:-) :-) :-)

1.
3a + 2a = 90
5a = 90
a = 90/5
a = 18°
2.
46 + a + 29 + 5a + 15 = 180
6a + 90= 180
6a = 180 - 90
6a = 90
a = 90/6 = 15°