Tolong bantu jawab no 21 dan 24. Makasihh

21.)
4x + 6x + 80° = 180°
10x = 100°
x = 10°

sudut A = 4x = 4 × 10° = 40° (b)

24.)
6z = 66°
z = 11°

9z + y + 6z = 180°
15z + y = 180°
15 × 11 + y = 180°
165° + y = 180°
y = 15°

Jadi, nilai y dan z berturut-turut = 15° & 11° (a)