Re: [Goanet] How can this be? by Ferdinando Reis Falcao

[Dr . Ferdinando dos Reis Falcão]

On Thu, 03 Mar 2011 09:59:36 -0800, E DeSousa wrote :  <<< Answer: This comes 
under "optical illusion" 1. Calculate the
wedge angle of the green wedge (tangent inverse of 2/5)= 21.8  degrees…….>>>

 

RESPONSE : You are about right Sir, Mr. E. de Sousa; although your figures of 
degrees are slightly wrong (2 : 5 of 90 degrees is 25.+ : 64.+)In fact
the figure is not a triangle, but a quadrilateral. 

I would state it is an “Optical deceit”. 
Thanks, and I am happy that there is at least some intelligentsia in this 
forum. 



Dr. Ferdinando dos Reis Falcão.