You can use the Rectangle tool in the Create Sketch toolbar menu to quickly draw a rectangular face. Extrude the face to create a rectangular volume.

Keyboard shortcut: R

Use the axes to ensure you're drawing in the correct direction:

You can draw rectangles on the X, Y, or Z-axis. As you draw, you can specify a dimension by simply typing in a value, which will bring up the Edit Dimension dialog. Hit Enter or press OK to accept the dimension.

To draw a rectangle, click to set the first point in your sketch.

Line colors by axis:

  • X = Red

  • Y = Green

  • Z = Blue

When you finish drawing the rectangle, it becomes a face that can be extruded to create a volume.