Naming Geometry Elements

Bob · 2012-08-31 19:47:46

Good morning zee-f and bobbym,

I think 16C too.

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

Back after that.

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

zee-f · 2012-09-01 01:23:41

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.

zee-f · 2012-09-01 01:35:56

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 02:40:37

These are the correct answers
15-E
17-F

I got a 9 from 10

Bob · 2012-09-01 04:10:23

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

bobbym · 2012-09-01 05:10:07

Hi all;

Thanks for the answers.

zee-f · 2012-09-01 05:56:22

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.

Math Is Fun Forum

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

Re: Naming Geometry Elements

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

Re: Naming Geometry Elements

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

Re: Naming Geometry Elements

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

Re: Naming Geometry Elements

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

Re: Naming Geometry Elements

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

Re: Naming Geometry Elements

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

Re: Naming Geometry Elements

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