Prep question 1

Drawing angled lines starting from
absolute co-ordinates


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Open the file ACA1-01.dwg. Draw a line from absolute co-ordinate 522.1,0 at an acute angle of 28.61° to the horizontal and parallel to the stairs, with a length of 2675.

What is the distance from the start line of the stairs to the start of the line just drawn.

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AutoCAD uses co-ordinate points internally. If you click on screen to start a line AutoCAD automatically feeds the co-ordinates of the specified point into it's program. Sometimes a user is asked to specify these co-ordinates such as "draw a line from point 522.1,0". The first value is the x value of 522.1, then a comma which separates the x and y values, then the y value of 0.These values could simple be typed into the command line when asked to specify a point.

However Autocad also has a dynamic mode (DYN toggle button on) which displays these values on screen. So the first x value of 522.1 is typed into the 1st box which is either grey or blue, then the tab key is typed so that the input box moves to the other box which is the Y value, where 0 is typed in. In dynamic mode you must remember to use the tab key to move the input to the second input box before pushing the enter key, which then accepts both values. Pushing enter key prematurely results in the system incorrectly accepting whatever value is in the 2nd box at that time.

Once these start co-ordinates have been placed drag out the line in approximately the right direction (sloping upwards in this case). You will then see the box for the input for the length of the line which will be 2675. Then tab to the angle box to input the angle of 28.61 When you are satisfied that the data is correct (tab key allows you to toggle back to the line length if required) then push enter key to accept the correct length and angle values.

Use the distance tool, off the enquiry toolbar to measure the distance required.