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## DE = 1/2BC  (DE = EF by construction)
 
## DE = 1/2BC  (DE = EF by construction)
 
=== Evaluation at the end of the activity ===
 
=== Evaluation at the end of the activity ===
# Would this theorem apply for right angled and obtuse-angled triangles?
   
[[Category:Quadrilaterals]]
 
[[Category:Quadrilaterals]]
 
[[Category:Class 9]]
 
[[Category:Class 9]]
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