My Math Forum Geometry-related proofs

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 December 16th, 2008, 08:47 AM #1 Newbie   Joined: Dec 2008 Posts: 2 Thanks: 0 Geometry-related proofs Not using math more advanced that the 10th Grade (thus excluding the dot product) proof that: a)The diagonals of a rhombus (a four-sided polygon in which every side has the same length) are perpendicular; b)That connecting the medium points of consecutive sides of a quadrilateral will yield a parallelogram; c)That if (x1;y1);(x2;y2); (x3;y3) and (x4;y4) are part of the same line then: (y2-y1)/(x2-x1)=(y3-y4)/(x3-x4). Please make a step by step solution. Please help me
December 16th, 2008, 01:52 PM   #2
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Re: Geometry-related proofs

Quote:
 Originally Posted by grizzlyjoker Please make a step by step solution.
That means you want someone else to do all the work for you? Perhaps someone will, but I advise against it. Show what it is that you do not understand. For the first you need to understand congruence.

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