There are no examples on my textbook

Dinora

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Aug 19, 2010
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Construct ¯DE¯¯ so that DE = TR + PS
Construct ¯QJ¯¯ so that QJ = TR - PS
I am not sure what I am suppose to do in these two problems I am not given any examples.
There is a a segment that looks as follow:
.____________. ._______________.
T R P S

So I am not sure if I should just measure both lines above and create a DE line or how to even start to do it.
I need help please!
 
Dinora said:
Construct ¯DE¯¯ so that DE = TR + PS
Construct ¯QJ¯¯ so that QJ = TR - PS
I am not sure what I am suppose to do in these two problems I am not given any examples.
There is a a segment that looks as follow:
.____________. ._______________.
T R P S

So I am not sure if I should just measure both lines above and create a DE line or how to even start to do it.
I need help please!

1. With your straight edge, draw a line segment that looks to be longer than TR+PS. Label the left most point on the segment, D.
2. With your compasses measure off TR and lay it on the segment you just drew so that T is congruent with D.
3. With your compasses measure off PS and lay it on the segment so that P lies on R. Now, Label point S, E.
4. You now have a segment DE that is TR and PS laid end to end and hence, equal in length to TR+PS.

Now, do you know what to do for the subtraction?
 
Dinora said:
Construct ¯DE¯¯ so that DE = TR + PS
Construct ¯QJ¯¯ so that QJ = TR - PS
I am not sure what I am suppose to do in these two problems I am not given any examples.
There is a a segment that looks as follow:
.____________. ._______________.
T R P S

So I am not sure if I should just measure both lines above and create a DE line or how to even start to do it.
I need help please!


Since you have used the term "measure" to apply to a problem with directions stating "CONSTRUCT....." it appears that maybe you haven't read the lesson which accompanies these exercises. Please start by doing that....READ CAREFULLY, and study the examples in the lesson. I taught geometry for many years, using many different textbooks....so your statement that "there are no examples on my textbook" indicates to me that you haven't really looked. (Maybe if you looked IN your textbook instead of ON your textbook, you might find those examples).

You also might want to do a search on Google or your favorite search engine for "constructions in geometry" (I did such a search and got about 2,500,000 "hits".....some on the first page of results looked like they would be particularly helpful).
 
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