Answer:
The answer to your question is Ф = 210°; sin 120 = -1/2
Explanation:
Data
Ф = 7π/6
∠ = ?
sin Ф = ?
Process
1.- Convert radians to degrees using proportions and cross multiplication
π rad ------------------ 180°
7π/6 rad ---------------- x
x = (7π/6 x 180) / π rad
x = (7 x 180) / 6
x = 1260/6
x = 210°
2.- Find the sin of 210°
sin 210 = -1/2