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

You are not logged in.

|
Options

bob bundy
2013-09-27 01:42:40

Great news, well done!

Up to you where you post.  I'll find it.

Bob

bobbym
2013-09-27 01:41:54

New topic is best.

demha
2013-09-26 23:54:30

Alright so I sent in the my revision and got everything correct. Thanks all

I have another lesson I need help with. Would it be better to post here or make a new topic?

bob bundy
2013-09-26 17:40:33

Calling it a tall diamond is just another way of saying rhombus.  You are seeing lines that are not there. The definition of a rhombus requires it to have four sides.  What you have does NOT have four sides.

http://www.mathsisfun.com/definitions/rhombus.html

Earlier you said you would try answer D.  That is what I would choose.

Bob

demha
2013-09-26 09:11:48

It looks like a tall diamond. If cut in half, it can make two triangles.

bob bundy
2013-09-26 01:58:34

hi demha,

I think you need to forget completely about the earlier question, where the answer was a rhombus.  Start afresh with the four points.

If you plot them, look at the result and then join up, you get a rhombus.  But I don't think that is what they expect you to do.  I think I've met a similar Comp H question before like this.  They expect you to join point one to point two, two to point three, three to point four, and finally back to point one again.  If you do it like that you don't get a rhombus at all.  You get what .... ????

The question doesn't make this clear but if rhombus was marked wrong then I recommend you go with ........  you tell me.

Bob

bobbym
2013-09-26 01:28:06

If you counted the exterior angles too. That is not one of the choices.

demha
2013-09-26 01:25:54

Hi Bob,
Now seeing your image, I would go with D. But wouldn't it be considered as 4 right triangles that meet at a right angle?

bobbym
2013-09-26 01:24:13

Hi;

Congratulations for the 10.

For that problem I would not choose F.

bob bundy
2013-09-26 01:19:08

hi

See below for my graph.  What did you get?

Bob

Good news about the other work.

demha
2013-09-25 22:18:24

2. Now do the same with this list, and describe the shape. - I said E (previous question asks the same thing and I said it looks like a rhombus, which was right, this one is telling me to describe it [in other words, describe what a rhombus looks like] but I'm not exactly sure which triangle would best describe it)

(0,-1), (0,3), (1,1), (-1,1)
A A square
B Two acute angles that meet at the acute angles
CA triangle
D Two right triangles that meet at the right angles
E A rhombus
F Two obtuse triangles that meet at the hypotenuse

I would say for this one - F

By the way, my teacher replied for the previous math lesson and got 10.000!

bob bundy
2013-09-25 20:58:34

#### demha wrote:

My new answer would be C.

Yes, that's what I think too.

#### Stefy wrote:

Yes, I do.  And thank you for the implied compliment.

Bob

demha
2013-09-25 20:11:49

Hi Anonimnystefy,
It was really tempting to click on that spoiler, but I have resisted... for now.

Hi Bob,
I did #1 again.
First Set looks like a small triangle.
Second Set looks like a line segement.
Third Set looks like triangle.

My new answer would be C.

anonimnystefy
2013-09-25 19:18:02

Hi Bob

bob bundy
2013-09-25 17:41:59

hi demha

1. Draw a Cartesian Coordinate system for yourself, and then determine whether these sets of points form triangles - I said F

Set 1: (0,0), (1,1), (0,1)
Set 2: (-1, 0), (1,1), (3,2)
Set 3: (0,0), (5,0), (3,5)
A set 1 line segment, set 2    Triangle, set 3 line segment
B set 1 Triangle, set 2    Triangle, set 3 line segment
C set 1 Triangle, set 2 line segment, set 3 Triangle
D set 1 line segment, set 2 line segment, set 3    line segment
E set 1 Triangle, set 2    line segment, set 3 line segment
F set 1 line segment, set 2 Triangle, set 3 Triangle

I could do a diagram, but I know you like to work these out for yourself.  When I did this one, I accidentally put one point in the wrong place (swapped the x and y round) and that alters the question completely.  So my advice is, do a new graph and check your points very carefully.

2. Now do the same with this list, and describe the shape. - I said E (previous question asks the same thing and I said it looks like a rhombus, which was right, this one is telling me to describe it [in other words, describe what a rhombus looks like] but I'm not exactly sure which triangle would best describe it)

(0,-1), (0,3), (1,1), (-1,1)
A A square
B Two acute angles that meet at the acute angles
CA triangle
D Two right triangles that meet at the right angles
E A rhombus
F Two obtuse triangles that meet at the hypotenuse

I can see why you chose a rhombus for this.  But I think they intend you to join the points together in the order given.  Try this and I think you'll see that another answer is then visible.

3. (-1, 0), (2, 0), (2, 4), and (-1, 4) - I said B (this question is asking what shape do these points make. I said square but I guess this is more of a RECTANGLE so I would say A)
A a rectangle
B a square
Ca parallelogram
D a rhombus
E a triangle
F a line segment

For a square all the sides must be equal.  Your revised answer, A, is correct.

Bob