Coplanar Concurrent Forces/ Find Unknown Force/ Strength of Material

Hello Friends......Today we solve numerical related to coplanar concurrent forces.....in this numerical resultant is given and we have to find unknown force and angle......this is important topic of mechanics of solids

[@carolinechristie8825]

this helped so much ! thank you

[@darkerrorcode]

You moved psin(theta) to the other side of the equation without changing it to -