Protractor Tool: Creating angled guide lines

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Creating angled guide lines

Angled guide lines are useful to draw angled geometry such as a roof slope. To create an angled guide line:

  1. Select the Protractor tool (). The cursor will change to a protractor, aligned to the red/green plane and with its center point fixed to the cursor.
  2. Place protractor's center at a vertex of the angle.
  3. Click to set the vertex of the angle you will measure. The following image shows the protractor being placed at the angle's vertex.

  4. Move the cursor in a circle until it is touching the start of the angle (one of the lines). The following image shows the first line in the angle (from the vertex out along to the red square).

  5. Click to set the start of the angle.
  6. Press and release the Command (Microsoft Windows) or Option (Mac OS X) key.
  7. Move the cursor in a circle until the guide line is at the desired angle. Notice that the protractor has marks, indicating 15 degree increments, on its edge. The angle will snap to these tick marks when the cursor is close to the protractor while moving around the protractor. Conversely, angle will move in more precise (smaller) increments when your cursor is farther from the center of the protractor while moving around the protractor.

    Note: Press the Esc key at any point during the operation to start over.

  8. Click to create the guide line. The following image shows a guide line created at a 45 degree angle so that a profile of a roof can be drawn.