Architectural Drafting question

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vcoleman

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Hi, I just started an Architectural Drafting class and have not had Geometry in years. No textbook just these problems were given. Anyway, How do I transfer angle ABC which is shown to the new location with leg AB placed on the given line AB which is also shown at a different angle then it was when it was ABC angle. Bisect angle ABC at the new location?

The next question is dive the space between two lines AB and CD into 14 equal parts. The lines are parallel to each other, 4" apart. Using the 3/8" scale the width of the line divides easily into 12 parts. So what is the trick. I tried to use each different scale and divide the paper horizontally as well as diagonally but neither worked?

Thanks in advance for your help!
 
vcoleman said:
Hi, I just started an Architectural Drafting class and have not had Geometry in years. No textbook just these problems were given. Anyway, How do I transfer angle ABC which is shown to the new location with leg AB placed on the given line AB which is also shown at a different angle then it was when it was ABC angle. Bisect angle ABC at the new location?

The next question is dive the space between two lines AB and CD into 14 equal parts. The lines are parallel to each other, 4" apart. Using the 3/8" scale the width of the line divides easily into 12 parts. So what is the trick. I tried to use each different scale and divide the paper horizontally as well as diagonally but neither worked?

Thanks in advance for your help!
Click to expand...

I'm going to show you the "trick" by an example:

2 parallel lines (black) have a distance (green).

At one endpoint of the green line add a new line (blue). Mark (in your case 14) points with equal distances on the blue line (Use a compass with a fixed aperture). Connect the last point of the blue line with the other endpoint of the green line (thin black line). Draw parallels to this line through each point of the blue line. The green line is divided into equidistant parts.
 

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pappus said:
I'm going to show you the "trick" by an example:

2 parallel lines (black) have a distance (green).

At one endpoint of the green line add a new line (blue). Mark (in your case 14) points with equal distances on the blue line (Use a compass with a fixed aperture). Connect the last point of the blue line with the other endpoint of the green line (thin black line). Draw parallels to this line through each point of the blue line. The green line is divided into equidistant parts.
Click to expand...

Thank-you so very much!
 
To clarify, I was not asking you whether the message boards at freemathhelp allow people to upload diagrams.

I was asking whether you possess the knowledge required to obtain a digital image of the given diagram and post it in this thread.

(The Windows7 Snipping Tool makes for easy capturing (cropping) and saving a screen shot for uploading here; otherwise, PRTSCR key and MSPaint applet suffice.)

I'm not able to resolve your descriptions in the first exercise. :(
 
I do not have windows7. I believe you might be able to help me with the first question if I describe it better.
In Angle ABC, AB is a horizontal line. The given AB line is a slight diagonal line. I am supposed to transfer angle ABC to the new location with leg AB placed on the given line AB and Bisect angle ABC at the new location.
:confused:
 
vcoleman said:
AB is a horizontal line

AB … is a slight diagonal line
Click to expand...

You may not use the same name to label two different line segments.

If the 'slightly diagonal AB' is what you're calling the original AB after copying, then you should employ some system of notation to distinguish between original objects and copied objects. For example, you could say AB and AB', where AB denotes the original and AB' denotes the copy.

PS: You do not need Windows7 to create or upload an image.
 
Last edited:
vcoleman said:
I do not have windows7. I believe you might be able to help me with the first question if I describe it better.
In Angle ABC, AB is a horizontal line. The given AB line is a slight diagonal line. I am supposed to transfer angle ABC to the new location with leg AB placed on the given line AB and Bisect angle ABC at the new location.
:confused:
Click to expand...

I am not sure I understand your description of the problem, but my best GUESS is that you are being asked to COPY an angle, and then BISECT the copy you've made.

If you do a search on Google (or your favorite search engine) for geometric constructions, you will find a plethora of websites explaining how to use a straightedge and compasses to do the classic constructions of Euclidian geometry. (copying an angle and bisecting an angle are among those classic constructions). There are even some good videos demonstrating HOW to do the constructions. Here is a link to just one of the videos....you may find it helpful:

http://www.youtube.com/watch?v=UZjevRGLjTM
 
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