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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,480

**If an isosceles triangle PQR, in which PQ=PR=12 cm, is inscribed in a circle of radius 18 cm, find the area of the triangle**

1) Use the circle tool to create a circle with a radius of 18.

2) Put point P on the circle.

3) Draw a circle with radius 12 using P as the center.

4) Use the intersection tool to find the 2 intersections of the 2 circles, Label them Q and R.

5) Hide the smaller circle and use the polygon tool to create the triangle with P,Q and R as vertices.

6) Read off the value of poly1 and take it over to the ISC.

http://isc.carma.newcastle.edu.au/

there using the super techniques of experimental mathematics they will guess at a nice analytical form for all those digits.

7) Read off

this agrees with the analytical answer nicely.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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Hmm

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'Humanity is still kept intact. It remains within.' -Alokananda

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,480

Did you try this?

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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No, how does geogebra get the area?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'Humanity is still kept intact. It remains within.' -Alokananda

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,480

There are many ways to get the area of a triangle knowing 3 points.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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Oh, I remember. I have a formula.

Yes, I did this but using pen and paper rather than a maxhine

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'Humanity is still kept intact. It remains within.' -Alokananda

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,480

Then I suggest you try post #1 to see how it works.

Yes, I did this but using pen and paper rather than a maxhine

Yikes!

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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Why is it different?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'Humanity is still kept intact. It remains within.' -Alokananda

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,480

Better than me trying to explain in my words why not listen to the experts who understand it better.

http://www.mathisfunforum.com/viewtopic … 06#p266506

After you read all of that it should be clearer.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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bobbym wrote:

There are many ways to get the area of a triangle knowing 3 points.

Yup.

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bobbym wrote:

Better than me trying to explain in my words why not listen to the experts who understand it better.

http://www.mathisfunforum.com/viewtopic … 06#p266506

After you read all of that it should be clearer.

Who is the expert there?

When I did it using coordinate geometry, I'm also using the same method as Geogebra will. Why is that any different?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'Humanity is still kept intact. It remains within.' -Alokananda

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,480

Did you check my solution? I would not have got the idea without geogebra. These babies can also give you insight on how to do it with pencil and paper.

Who is the expert there?

Some mathematician, I failed to include the name. More importantly did you read it?

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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Yes, it is your solution that I did on pen and paper. Why do you still want me to do the same method on a computer again?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'Humanity is still kept intact. It remains within.' -Alokananda

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,480

Not again, first!

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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I beg your pardon?

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'Humanity is still kept intact. It remains within.' -Alokananda

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 84,480

Why do you still want me to do the same method on a computer again?

I was saying the problem should be done first on the computer.

I have the result, but I do not yet know how to get it.

All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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