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Topic review (newest first)

zee-f
2012-09-02 03:56:22

Your welcome Bobbym...

Bob Bundy your welcome, and

Each course has many lessons around 20-30 and the lesson is explained then on the bottom there are questions to answer.
I feel like am student and a teacher at the same. No tests only questions and a grade for each lesson. When I finish all the lessons I submit a  Credit Report Form (CRF) to get a grade for the whole course.

bobbym
2012-09-02 03:10:07

Hi all;

Thanks for the answers.

bob bundy
2012-09-02 02:10:23

hi zee-f,

Thanks for telling us the answers your teacher was expecting.  I seem to remember, way back, that I thought 15 E was a posible answer.

How are you expecting to be assessed for this work ?  Will you have to do an exam ?

Bob

zee-f
2012-09-02 00:40:37

These are the correct answers smile
15-E
17-F

I got a 9 from 10

zee-f
2012-09-01 23:35:56

17. If I have an angle, do I have a plane? 

17. I choose (F)Yes, because that means you have two lines that meet at a single point.
Explanation:
I have a common point another point on ray 1 + another point on ray 2 now I have three points and rays can be used to create a line. To have a plane two lines have to intersect in a single point, and an angle intersects in a single point.So,
I have a plane.

zee-f
2012-09-01 23:23:41

I posted this to my teacher:


15- I choose A-No, because rays need one endpoint

15- Explanation:
Well as mentioned in the lesson because a ray continues indefinitely in one direction, but has a definite endpoint in the other direction, but a line needs two points to define it but it goes beyond these points it doesn't have a starting or ending point it keeps going forever.

she said #15 is incorrect.  If a ray exists, then it contains the two points that are needed to define and name it.  How many points are needed to define and name a line?
 

am going to submit this as a new answer:

#15- Two points are needed to define and name a line. So the right answer is (E)

15. In figure 1 above, can ry_EH be used to create a line?

E- Yes, because any two points can be used to make a line


But for #17- B, and E were in correct answers. neutral

bob bundy
2012-09-01 17:47:46

Good morning zee-f and bobbym,

I think 16C too.

I'm going to have a long think about 17. 

Back after that.  smile

LATER EDIT:

From Mathswords.com:               angle = Two rays sharing a common endpoint.

I have an angle
=>    I have two rays sharing a common endpoint
=>    I have a common point + another point on ray 1 + another point on ray 2
=>    I have three points
=>    I have a plane
=>    Answer B is correct

Bob

bobbym
2012-09-01 10:29:15

I originally had C in post #16. Let me know what they give as the right answer.

zee-f
2012-09-01 10:28:11

I think am going to try E

17- E-No because rays cannot be extended into lines

17-Explanation:
To have a plane two lines  have to intersect in a single point or are parallel. Rays  have an end point they cant extend to lines. lines don't have end points to start or end them they just have two points to define them.

Ok enjoy am going to rest to

bobbym
2012-09-01 10:18:22

An angle is two rays with a common endpoint. Try F then as long as the rays are two different ones with a common endpoint.

See you later, going to eat.

zee-f
2012-09-01 10:14:48

or E because  a ray has an end point and a line doesn't

zee-f
2012-09-01 10:12:31

But in the lesson it mentioned that A plane is defined by any of the following:

three points not lying on a line
a line and a point not lying on the line
two lines which intersect in a single point or are parallel

So doesn't that make 17-F because an angle has unites two rays in a single end point so then we have two lines that meet at a single point and  two lines which intersect in a single point or are parallel are defined as a plane

zee-f
2012-09-01 10:02:43

Now am stuck on #17 B was incorrect when I submitted it to my teacher I still don't get why?


17. If I have an angle, do I have a plane?

A Only if you have an additional point not on the angle
BYes, because any two rays can define a plane
CNo, because there aren't enough points
DYes, because angles are big
E No because rays cannot be extended into lines
F Yes, because that means you have two lines that meet at a single point

zee-f
2012-09-01 10:00:56

Well after reading the lesson two more times I came up with this

14- I choose D-Yes, because every line segment can be extended into a line

14- Explanation:
Yes ls_BC can become a line because Every line contains a line segment, and every line segment can be extended into a line.


15- I choose A-No, because rays need one endpoint 

15- Explanation:
Well as mentioned in the lesson because a ray  continues indefinitely in one direction, but has a definite endpoint in the other direction, but a line needs two points to define it but it goes beyond these points it doesn't have a starting or ending point it keeps going forever.

bobbym
2012-09-01 09:48:21

Hi Bob;

Who are you hiding your answers from ?

In case she wants to work on it a little more without seeing mine. Also, in case someone else pops in and would like to answer the questions.

On some other forums they insist you hide your answer to any post. That allows other people to post their answers. I know we do not have that many people answering questions but...

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