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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteTo draw a line with an exact length and direction in LibreCAD, start Draw → Lines → 2 points, choose the starting point, then enter a relative polar endpoint such as @50<30 in the command line. This makes a 50-unit line at 30° from the X axis. First set the drawing’s main unit if you need those units to mean millimeters, inches, or another measurement.
Set the drawing unit first
LibreCAD interprets coordinate values in the drawing’s units. To set them, open Edit → Current Drawing Preferences → Units and choose the main unit, such as millimeters. Menu wording can vary by version or platform. This unit setting determines what a value such as 50 represents in the drawing.
Draw a line with an exact length and angle
- Choose Draw → Lines → 2 points.
- Place the starting point. The relative coordinate origin moves to that point in this workflow.
- When LibreCAD prompts for the next point, activate the command line and enter
@length<angle. For example,@1.25<25draws a line 1.25 drawing units long at 25° from the X axis. - Press Enter to accept the endpoint and complete the line.
The @ marks the coordinates as relative to the current point, and < introduces the polar angle. LibreCAD’s documentation describes coordinate entry for lines and other entities using absolute or relative coordinates in its Fundamentals documentation. The 2.2-series documentation gives this relative-coordinate syntax.
Choose a direct-entry tool for horizontal or vertical lines
If the line must be horizontal or vertical, use the dedicated tool and enter its length in the tool options. The Angle tool accepts both a length and an angle. LibreCAD describes the Angle tool as drawing a line with an assigned length and angle in its Drawing Tools documentation.
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#1 Best Overall
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Use relative Cartesian input when that is clearer
You can also specify the endpoint as relative X and Y movement. For example, @0,100 advances 0 units in X and 100 in Y; @100<90 expresses the same vertical movement as a relative polar coordinate. Polar input is usually more convenient when you know the desired length and angle; Cartesian input is useful when you know the exact X and Y offsets.
Do not confuse a dimension label with line length
A dimension annotation displays a measurement; it does not resize the geometry. LibreCAD’s drawing preferences documentation explains that the dimension length factor changes the displayed value while the entity remains the length as drawn. Add a dimension when you need a visible measurement, but enter the desired coordinates or use a length-based line tool to create geometry of that size. See Drawing Preferences and the Linear Dimension manual.
Quick Recap
Best Value
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Rank #4
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Rank #2
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