You bend a reference symbol as follows:
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Select to open the Symbol Format dialog box.
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Click the Line Style tab and select the jagged line symbol from the Corners list.
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Click OK to return to the diagram.
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Press and hold ctrl while clicking the point on the reference where you want to insert an angle.
A handle is added to the reference at the point clicked.
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Release ctrl. You can now drag the handle to create the desired angle.