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To start drawing the arc, use the menu command Draw - Arc defined by 3 points or this icon. Using the slider at the top of the window, you can change the size of the symbol previews. In this panel, each symbol displays its name underneath the symbol. Snap can be entered in metric or imperial units, e.g., 4 mm, 0.5", 1/2", etc. If you want to enter the coordinates with units (e.g., "5 cm"), press F12 in the symbol editor, select Symbol and check the box Use units in the Properties panel. This is convenient, because the values can be changed using the mouse wheel. In the symbol editor, object coordinates are given in tenths of a millimeter.
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If the page scale is set, the coordinates of objects can be entered in the form number unit or number fraction unit in the Properties panel. In the program settings: F12 - System - Others you can select which units to display:
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