Need help with tension triangular problem

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Homework Statement



Need help with problem #4 and #6

Homework Equations


don't know where to start


The Attempt at a Solution



attempt at number 4, I used T1 T2 T3 as tension for each side, since the weight is the force downward the two side that connect to the weight so each side should get half, 274 N and using tangent. I got 548/tan(60) and got 316.387N is this right?

number 6 I understand the CG of the block must get past the rotational point at the bottom right corner
 

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