When you launch Protractors, the protractor appears on the screen
as shown here
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The screen display shows the protractor.
The angle tracking lines are visible as the red and green lines
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Facets of Protractors' behaviour are controlled in two ways.
Some controls are on the faces of the protractors themselves. Other controls
are in the Protractor's application menus.
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The simplest on-protractor control is the ability to move the protractor
around on the screen. When the protractor is moving, it turns partially transparent so you
can see through for more accurate positioning this behaviour is selectable
via the Opacity menu.
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Move the Protractor either by
dragging it around with the mouse, or by pressing the Arrow Keys on the keyboard.
When using the Arrow Keys, pressing the Shift Key multiplies the movement amount by ten
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As you move the mouse around the screen,
four angle tracking lines follow the mouse around to help you with precise
positioning and alignment. The red line follows the position of the mouse. The
three green lines provide the opposite and perpendicular angles.
Angle Displays appears on the protractor and
provides real-time interactive tracking of the mouse angle. On most of the scales, the sine and
cosine of the angle are also displayed
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Follow the On Protractors Controls list for those
controls that are on the protractor face. Follow the Menus list for those controls
available from the application pull-down menus.
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