Set the sliding compound miter saw to cut right-hand miters on the baseboards that will lie flat against the ceiling. Start with the blade in its center vertical position, then rotate it 45-degrees to the right. Cut four baseboards with the saw in this position. Then reposition the saw to cut left-hand miters on four additional baseboards, rotating it 45-degrees left of center. You now have eight boards with a miter on one end. Before you secure these baseboards to the ceiling, measure required lengths and cut the other ends for scarf joints where they will join each other in the middle of the walls to form one continuous baseboard.
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