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It depends on your definition of beauty. 

Can somebody explain the most beautiful equation in math thanks  

A = π r²  is beautiful, but trying to visualize irrational pi is troublesome. 

e = mc²   is beautiful, but it's much too difficult for somebody like me. 

My vote has to go for  c² = a² + b²  

It's easy to understand.  Draw a right triangle, then draw a square onto each side. 

Visualize the area of the square on the hypotenuse equal to the sum of the areas

of the other two sides.  Simple and elegant.  Thanks, Pythagoras, I owe you one. 

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