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muhabhūmivisesumhi du ucchehabhajidamhi sā have vaddhi vaddhi icchāgunidā muhasahidā sū phalam hodi ||
When the difference between the top (a) and the base (b) is divided by the height (h) [of a trapezoid), it will be the (rate of increase) (r). The (rate of) increase, when multiplied by an optional number (x) and increased by the top, becomes the fruit (y). (Cf. Fig. 1) (Stanza 17 cited in the Dhavalā on CK 1.3.5; vol. 4, p. 57)
y=rx+ a, where r=
Cf. T'iloyupunnatti 1.176 177.
X
Figure 1: Rate of increase
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