Respuesta :

CastleRook
To find the value of x we use sine rule given by 
a/sin A=b/sin B=c/sinC
the value of x will be given by:
∠F=180-(127)=53°
13/sin 53=x/sin 87
solving for x we get
x=[13sin 87]/sin 53
x=16.2555~16.3 cm