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You can create three kinds of guides, and you use the Tape Measure (T) tool to make them all, as shown in Figure 3-27.

 Parallel guide lines: To create a guide that's parallel to an edge, select the Tape Measure tool, and click anywhere (except the endpoints) along an edge. Then move your mouse, and a parallel dashed guide appears. Click again to place the guide wherever you want.FIGURE 3-26: Use guides to measure things before you draw.

 Linear guide lines: To create a guide along an edge in your model, click anywhere along the edge except on either endpoint. Then click again anywhere else along the edge.

 Guide points: You may want to place a point somewhere in space; you can do exactly that with guide points. With the Tape Measure tool, click an edge’s endpoint and then click again somewhere else. A little x appears at the end of a dashed line. That’s your new guide point.

FIGURE 3-27: Use the Tape Measure tool to create guide lines and points.

Here’s an important point about the Tape Measure tool: It has two modes, and it creates guides in only one of them. Pressing the Ctrl key (Mac: Option) toggles between the modes. When you see a + next to your cursor, your Tape Measure can make guides; when there’s no +, it can’t.