December 16th, 2008, 08:47 AM  #1 
Newbie Joined: Dec 2008 Posts: 2 Thanks: 0  Geometryrelated proofs
Not using math more advanced that the 10th Grade (thus excluding the dot product) proof that: a)The diagonals of a rhombus (a foursided 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: (y2y1)/(x2x1)=(y3y4)/(x3x4). Please make a step by step solution. Please help me 
December 16th, 2008, 01:52 PM  #2  
Senior Member Joined: Jul 2008 Posts: 895 Thanks: 0  Re: Geometryrelated proofs Quote:
 

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