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Creates a tangent line from an arc, circle, or ellipse.

1. Click on the side of the arc or circle from which you want to draw the tangent line.
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2. A tangent line appears from the selected point. Click to set the length, or enter the length in the Inspector Bar.
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3. Move the cursor to set the line angle, or enter the angle in the Inspector Bar.
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   To switch the side of the tangent line, pass the cursor through the tangency point.
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