Prop 17 from Euclid works...

This is a way of checking whether we can get the sum of two angles to be as large as 180 degrees, or as large as the "sum of two right angles". Euclid asserts, in Proposition 17 of Book I, that the sum of any two angles in a triangle will always be less than the sum of two right angles.

 

Jeff Barrett

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Resource Type
Activity
Tags
131  course  geometric  mat  reasoning 
Target Group (Age)
10 – 19+
Language
English
 
 
 
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