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I'm designing an oak coffe table for a client that is shaped as a righht triangle. Both of the legs are 66" long and the hypotenuse is just under 8'. The table is supported with 18" long x 3" square legs in each corner. The rails will be tied into the legs with mortise and tenon joinery, and the legs will also be supported with angled corner blocks that are screwed into the rails with pocket screws.
My question is do I need to install yet a 4th leg midway along the length of the hypotenuse? I would think that if someone would sit on that edge the table may tilt.