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origami

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A 1.5:1 rectangle 2009-03-23
melody pose la question :
I have an origami model that says to use a 1.5:1 rectangle. I don't understand how to calculate the size of paper I need to use. Surely there is a formula to calculate this ratio? Thanks for your help.
Penny Nom lui répond.
The volume of a tetrahedron 2004-02-03
Joseph pose la question :

How do I calculate the volume of a bird tetrahedron. I'm trying to find out to get extra credit. I came with this idea while making a origami tetrahedron.

Joseph

P.S. Do you by any chance have instructions for orig ami figures. If you do, please send me some. Thanks!


Penny Nom lui répond.
Can a square be a rhombus? 2003-03-04
Beth pose la question :
Can a square be a rhombus? Some sources say yes, some say no. Some sources define a rhombus as a quadrilateral and parallelogram with equal sides, but without right angles. Some sources say a square is a special case of a rhombus. Clarity, please!
Walter Whiteley lui répond.
 
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