Semicircles divided into equal sectors
Fan-divided half-circles annotated with counts, part of the quadrature studies
Rows of semicircles: three at the top are divided into radiating fan-like sectors while the ranks below are plain half-circle arcs, and small hatched dome-like shapes appear at the lower left. The brief annotations count the sectors, marking the third semicircle '4 and 4', the second '3 and 3 over 4', and the first '2 and 2 over 4'. A final note reasons that this half, once the value 4 is removed, equals the remaining half. Further small dome- or vault-like sketches at the lower left carry no transcribed text.
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Counting the sectors of divided semicircles
The fan-divided half-circles are tallied by their parts: the third '4 and 4', the second '3 and 3 over 4', the first '2 and 2 over 4'. A closing remark states that this half, once 4 is taken away, equals the half that remains.