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Clicking and dragging on the ends of the arc does allow one to change its angle. This allows one to make an arc whose angle is 90 degrees (quarter circle) or 180 degrees (half circle).
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I create a quarter arc. If I click on it I see only 6 resize squares. If I go with mouse to one end of line of quarter arc I see only a little line with arrows. I cannot change a point to an other angle of the arc.
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Clicking or dragging on one of the 6 resize squares on the arc allows you to rotate it (with the command key down).
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The canvas is the drawing region - the part of the window you use for drawing.
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Jochen