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posted by kumar .
1.Without using Pythagorus theorm, prove that the points (4,3), (2,2),(8,2)are the vertices of a right angled triangle.
2. The 3 vertices of a parallelogram taken in order are (3,4),(2,3), (3,2).Find the coordinates of the fourth vertex ?
can u pl explain me in detail.

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Steve
how far have you gotten using Reiny's suggestion?
For #2, you might also look at it as involving the translation of one line onto a parallel line.
The line from (2,3) to (3,4) is one side of the parallelogram.
If you translate (2,3) to (3,2) then you have moved it by (1,5). So, move the other end of the line by the same amount, and you will have found the other end of the parallel side.
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