Answer:
24°
Step-by-step explanation:
72÷3=24
∠ 1 = 24°
∠ WXZ = ∠ WXY + ∠ YXZ , that is
72° = ∠ 1 + 2∠ 1 = 3∠ 1 ( divide both sides by 3 )
24° = ∠ 1