Two Circle Diagrams on the Quadrature of the Circle
A largely blank, faded leaf with two rosette-like circle figures and their proofs
A largely blank and heavily faded leaf, torn at the upper left, carrying two compass-drawn rosette-like circle figures down the right-hand side with short accompanying proofs. Leonardo shows a minor circle entering four times into a middle circle and into its circular parallel, so that the remainder of the parallel equals the greatest square of the middle circle. A second figure is worth the greatest square of the circle sub-double to the greatest circle; further faint offset and untranscribed text is present across the sheet.
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A minor circle entering four times the middle circle
The minor circle enters four times into the middle circle a b c d and four times into the circular parallel. The sixteen portions removed from the parallel are worth the four greatest portions of the middle circle, so the remainder of the parallel equals the greatest square of the middle circle.
The greatest square of the sub-double circle
Removing the two smallest circles a b from the greatest circle leaves two curvilinear triangles worth the circle sub-double to the greatest; removing from them the two bi-angles d c, worth the four greatest portions, leaves an unhatched remainder equal to the greatest square of that sub-double circle.