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#51 2012-08-31 19:47:46

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,428

Re: Naming Geometry Elements

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


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#52 2012-09-01 01:23:41

zee-f
Member
Registered: 2011-05-12
Posts: 1,220

Re: Naming Geometry Elements

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


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#53 2012-09-01 01:35:56

zee-f
Member
Registered: 2011-05-12
Posts: 1,220

Re: Naming Geometry Elements

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.


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#54 2012-09-01 02:40:37

zee-f
Member
Registered: 2011-05-12
Posts: 1,220

Re: Naming Geometry Elements

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

I got a 9 from 10


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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#55 2012-09-01 04:10:23

bob bundy
Moderator
Registered: 2010-06-20
Posts: 6,428

Re: Naming Geometry Elements

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


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#56 2012-09-01 05:10:07

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 87,258

Re: Naming Geometry Elements

Hi all;

Thanks for the answers.


In mathematics, you don't understand things. You just get used to them.
Of course that result can be rigorously obtained, but who cares?
Combinatorics is Algebra and Algebra is Combinatorics.

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#57 2012-09-01 05:56:22

zee-f
Member
Registered: 2011-05-12
Posts: 1,220

Re: Naming Geometry Elements

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.


One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

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