Finding the Third Force to Achieve Zero Total Torque on an Equilateral Triangle

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To achieve zero total torque on an equilateral triangle with forces F_1 and F_2 acting along two sides, a third force F_3 must be applied at point B along side BC. The sum of the torques around point O must equal zero, necessitating the calculation of the forces in component form. Identifying the perpendicular components of the forces relative to point O is crucial for determining the required force F_3. Participants suggest preparing calculations and visual aids to clarify the problem. Understanding the relationship between the forces and their points of application is essential for solving the torque equation effectively.
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http://img300.imageshack.us/img300/4792/physics1gj9.th.png

"Two forces F_1 and F_2 act along the two sides of an equilateral triangle as shown...Point O is the intersection of the altitudes of the triangle. Find a third force F_3 to be applied at B and along BC that will make the total torque zero about the point O."

So the sum of the torques = 0. I don't know what to do first. Should I put the forces into component form and take the tangential component of the forces??
 
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Unfortunately, I can't see the image, but putting the forces into components would be a good start.
 
Click on the image.
 
merced said:
Click on the image.

I don't have anything to click on, it's my computer, probably. Someone else will be able to give an exact reply to you. In the meantime, prepare some work to present.
 
I guess what I mean is, how do I determine what is perpendicular to the intersection (O)? Because I have to use the perpendicular force right?
 
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