Circles worth half the greatest circle; a money reckoning
A four-circle proportion study, with an unrelated account in denari, ducats and soldi added upside down in another hand.
A faded and torn leaf, its lower portion lost, carrying a lettered study of four nested circles in which two equal circles and a middle circle are each shown worth half the greatest circle. Turned upside down and written in another hand is an unrelated column of money reckoning in denari, ducats and soldi. The transcribed geometrical note breaks off mid-sentence ('all the 2 circles that shall be made ...'), and further faint, untranscribed jottings and small figures are visible across the sheet.
On this page
Nested circles each worth half the greatest
The circles a c and c d are equal and each worth half of the greatest circle, and the middle circle a b is likewise worth that same half. From this Leonardo begins to draw a consequence about all the pairs of circles that may be constructed, though the note breaks off before completing the argument.
Money reckoning in another hand, upside down
Rotated relative to the geometry and written in another hand is a column of sums in the coinage of the day: denari, ducats and soldi (Denari 16, Ducats 7, soldi 12, and so on). It is an ordinary tally of money, unrelated to the geometrical figures on the sheet.