________________
2
A-3{(4=m/a)+ (72)"}
Mahāvīra gives another set of formulas employing v10 for n.
vadanārdhono vyāso daśapadagunito bhavet parikșepaḥ | mukhadalarahitavyāsārdhavargamukhacaraṇakştiyogaḥ| daśapadaguņitaḥ kṣetre kambunibhe sūkşmaphalum etat ||
The diameter (d), when decreased by half the mouth (m) and multiplied by the square root of ten, will be the perimeter (p). The sum of the square of half the diameter decreased by half the mouth and the square of a quarter of the mouth is multiplied by the square root of ten. This (result) is the accurate area (A) of a conchshell-like figure. (Ganitasārasaṁgraha 7.65-6)
p=vod-.) A=vio{(4=;/2) + (7)"}
Whether my emendations of Stanza 13 cited by Vīrasena are correct or not, it is certain that the origin of Mahāvīra's problem of 'conch-shell-circle' can be traced back to the calculation of the volume of a conch-shell in the Jaina
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