Final answer:
Lumber with annual rings at an angle between 60 to 90 degrees with the board surface is called quarter sawn. This sawing method is connected with the appearance of wood patterns. Mortise and tenon are common woodworking joints.
Step-by-step explanation:
Most lumber is cut so that the annual rings form an angle between 60 degrees and 90 degrees with the surface of the board. This is referred to as quarter sawn. When viewing wood in a cross-section, the annual pattern of changing cell characteristics creates annual rings, while in the longitudinal sections, the yearly pattern appears as parallel lines. When a tree's annual rings vary in density and width, it is indicative of the different growing conditions from year to year, such as alternating periods of wet and dry weather.
In woodworking, mortise and tenon are common joints where a protruding tenon from one piece fits into a mortise hole of another.The angle at which the annular rings of most lumber are cut with the surface of the board is referred to as quarter sawn. In quarter sawn lumber, the annual rings form an angle between 60 degrees and 90 degrees with the surface of the board. This type of sawing technique provides stability and durability to the wood, and it also enhances the wood's decorative appeal.