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              In the figure below, prove that the area of 
				a right triangle ACB of altitude CH is equal to the sum of the areas 
				of the lunes A1, A2, A3, and A4. 
					
                
					
                
						
                
					
              Hippocrates of Chios (c.470 BC - 
				c.410 BC) was a Greek mathematician who worked on the classical 
				problems of squaring the circle and duplicating the cube. 
					 Squaring the circle or the 
				quadrature of the circle  is one of the three great 
				problems of Classical Geometry. It is the challenge to construct 
				a square with the same area as a given circle by using only a 
				finite number of steps with compass and straightedge.
  See also:
				Hippocrates 1, 
				Hippocrates 2,
				Hippocrates 3,
				Squaring the Circle,
				Pythagoras and 
				Circle Area,
				Similar 
				shapes. 
						
              		    
					
  
  
						
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