here, each of the points is a vertex of a triangle that is obtained by connecting all the points. you can think of a vertex here as a sharp or pointed edge of a figure. see here for more info

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- January 12th 2008, 03:43 PM #1

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## ....question...

I hope and pray that this thread does not get neg feedback....

Ok I am trying to find the area of three points;

A=(-2,5) B=(1,3) C=(-1,0)

I am following the text books examples on how to do this and so far it's working out.**BUT**in the text/example it talks about the "right angle is at*vertex B*."

MY question is (to understand this); what does the word*vertex*mean?

Thank you in advance for any reply/help

- January 12th 2008, 03:53 PM #2

- January 12th 2008, 08:12 PM #3
Since the area of a single point is zero, the area of three three points will be (3)(0) = 0

Do you understand*why*the angle at B is a right angle?

What will you do when the triangle you get by connecting three points does NOT contain a right angle?

- January 13th 2008, 05:54 AM #4

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- January 13th 2008, 06:10 AM #5

- January 13th 2008, 06:29 AM #6

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- January 13th 2008, 12:43 PM #7

- January 14th 2008, 06:49 PM #8

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