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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,918

hi

See below for my graph. What did you get?

Bob

Good news about the other work.

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

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**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,423

Hi;

Congratulations for the 10.

For that problem I would not choose F.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**demha****Member**- Registered: 2012-11-25
- Posts: 195

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?

"The thing about quotes on the Internet is you cannot confirm their validity"

~Abraham Lincoln

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**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,423

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

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,918

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

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

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**demha****Member**- Registered: 2012-11-25
- Posts: 195

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

"The thing about quotes on the Internet is you cannot confirm their validity"

~Abraham Lincoln

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,918

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

*Last edited by bob bundy (2013-09-25 19:41:50)*

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

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**demha****Member**- Registered: 2012-11-25
- Posts: 195

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?

"The thing about quotes on the Internet is you cannot confirm their validity"

~Abraham Lincoln

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**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,423

New topic is best.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,918

Great news, well done!

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

Bob

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

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,646

Compuhigh.com have asked that we remove this topic "in order to ameliorate the harm to later students who may find the question and answer in an internet search".

I have responded to them "I am awaiting permission from two forum members ... seems a shame as the student was very engaged in the process and learned a lot with members help, as would others visiting the page. There are likely to be many places on the internet (facebook, reddit, etc) where your students will find answers to previous questions, it seems easier to simply change your questions (even a little) every year."

Ignoring many arguments (and a heavy heart), it simply seems like a nice gesture to Compuhigh to remove it.

With your permission anonimnystefy and bob?

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,918

hi MathsIsFun

Thanks for asking. I, too, am reluctant to lose this thread, for the same reason. There is so much that I could also say about their course assessment method, but I'll 'bite my tongue' and stay quiet. Yes, you have my permission.

Bob

ps. see also pm

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

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