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Cut the annulus of the Lavana sea at its vertex as shown below (cf. Fig. 2) -
AB
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Figure 2: A circular annulus penetrated at its vertex and then make it straight keeping its breadth (rundra) 21 as it is (cf. Fig,
3).
B
Figure 3 : An Isosceles Trapezium with its altitude Thus it becomes an isosceles trapezium (visama caturbhuja).
'विक्खंभवग्ग' इत्यादिना The square of the diameter (visakambha) etc. The complete rule is like this:
foarth Cephut acck out alati (TLS v.96 first half, p. 88)
The square root of ten times the square of the diameter becomes the circumference (paridhi) of a circle.
By this rule, find the subtle measures of the face (mukha) DC (= 11.11.10) and base (bhūmi) AB (= 51.51.10) of the isosceles trapezium in quadratic forms viz. DC = 11.11.10 and AB = 51.51.10.
Halve the sum of the measures of the face and base to calculate the measure (madhya phala) (pl. 1.10) of the mean side EF and then draw it.
Arhat Vacana, October 2000
