Letter B. Combination try and miter square
Explanation
A miter square or mitre square is a hand tool used in woodworking and metalworking for marking and checking angles other than 90°. Most miter squares are for marking and checking 45° angles and its supplementary angle, 135°.
Try and mitre squares are marking and checking tools used to assess angles and mark straight cuts. ... A try square is used for checking right angles (90°) and a mitre square is for 45° angles (135° angles are also found on mitre squares because they are created by the 45° intercept).
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