Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,071

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

Children are not defined by school ...........The Fonz

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

Offline

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

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.

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

Offline

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

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

Offline

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

These are the correct answers

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

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,071

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

Children are not defined by school ...........The Fonz

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

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 96,664

Hi all;

Thanks for the answers.

**In mathematics, you don't understand things. You just get used to them.**

**If it ain't broke, fix it until it is.**

Offline

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

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.

Offline