Tolong jelasin yg no. 2 + cara pengerjaannya please kak

Dik :
F1 = 10 N; R1 = 2 m
F2 = 15 N; R2 = 1 m
F3 = 20 N; R3 = 1 m
sin37° = 3/5
sin53° = 4/5

Dit :
Στ = ___?

Jwb :
Στ = ΣFR
Στ = (F1.R1)-(F2.R2.sin37°)-(F3.R3.sin53°)
Στ = (10.2)-(15.1.³/₅)-(20.1.⁴/₅)
Στ = 20-9-16
Στ = -5 Nm (arah berlawan jarum jam)