How to lay vinyl flooring when the wall runs diagonally
For a diagonal wall, measure the actual angle and then transfer that angle to the board to be cut.
Use a protractor or folding ruler to get the corner of the wall. Mark the cut line on the board, place the decorative side up, then bend or saw off the excess corner.
The leftover plank from the previous row can be used to start a new row. Stagger the end joints of two adjacent rows at least 30 cm.