tolong dijawab ya bsk dikumpul

1.
90° = 3a + 2a
90° = 5a
90°/5 = a
18 = a

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

maaf kalau ada kesalahan