Grasping at Straws « Continuities - The Diigo Meta page

• 21 Apr 09
  

  James Freeman

  SSS

• 24 Apr 08
  

  Bert Hopkins

  math geometry congruence education

  • • Ths is one of the best lessons I've seen!!
      
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  • Question 1: Are all quadrilaterals with congruent corresponding sides necessarily congruent?¹
     Students began by cutting a drinking straw into four pieces, threading the string through, and tying it off to form a quadrilateral. They quickly realized that they could “move” the angles, so nope, this is not true. Unexpected bonus: discussion of concave/convex.

    • This is a great question. You should read more!!
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  • Question 3: Are all triangles with corresponding sides congruent necessarily congruent?
     Make the triangle with straws… conclusion, yep, this does guarantee congruent triangles as the angles are “locked”

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• 16 Apr 08
  

  Wendy Smith

  gmst525

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• 
  Bert Hopkins on 2008-05-14
  Ths is one of the best lessons I've seen!!
  
• 
  Bert Hopkins on 2008-05-14
  This is a great question. You should read more!!

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