Set the table saw fence 3 inches from the blade, which is twice the width of a 2-by-2. Start the saw and cut a piece of plywood 3 inches wide using the fence as a guide. Turn the saw off. (Note: A 2-by-2 is dimensional lumber that measures 1 1/2 inches wide.)
Set the 2-by-2 on the plywood with one end flush with the plywood end and the left edge of the plywood and the opposite end of the 2-by-2 flush with the right side of the plywood. Mark the edge of the 2-by-2 on the plywood and remove the 2-by-2.
Apply double-sided tape to the plywood piece along the marked line. Remove the tape backing. Place the 2-by-2 on top of the tape, with the edge aligned with the marked line. Press the 2-by-2 firmly onto the tape.
Place the plywood on the table saw with the right edge against the fence. Set the fence so the table saw blade aligns with the leading corner of the 2-by-2.
Start the saw and feed the plywood and 2-by-2 through the blade while keeping the edge of the plywood against the fence. The plywood will have a straight cut, but the 2-by-2 will be cut in two diagonally between opposite corners.