Lay the laminate flooring in the manner recommended by the manufacturer until you reach the board that will terminate against the angled wall. Place a straightedge onto the edge of the last laminate floorboard in the row before where the angled board will need to be, and extend it toward the wall. Mark a chalk line along the edge, leading from the board edge to the wall, and then remove the straightedge.
Place a bevel square so that the body of the T-shaped tool lies along the line you marked. Rotate the blade of the bevel square, the T portion, until it’s flat against the angled wall, re-creating the angle of the wall at the line. Turn the screw on the handle to lock the angle in place.
Measure the length of plank needed for cutting with a tape measure. Subtract 1/8 inch from the measurement to allow for the usual expansion gap between the floorboard and the wall.
Place the bevel square onto the laminate floor plank at the adjusted length position where you need to cut to fit the angle. Mark the angle along the bevel edge onto the board with a pencil.
Cut the board along the marked angle with a circular saw. Test-fit the board before laying the board in place along with the rest of the floor planks.
Repeat the cutting process for the remaining boards along the angled wall.