________________
Figure 3: Circular Arc
AL"
TN 2 -->
The validity estimation of (3.11) may be easily inferred from its percentage error Ee (refer Table 3.1):
5-16-14 100 - [1si" 8 * 6.2016 cover * - 12 100
wherein 1 =2r sinõ, h = r(1 -coső), so = 2rð.
Table 3.1
Ep = 0 E15 = 0.11 E30 = 0.40 E45 =0.73 E60 = 0.92 E75 = 0.47 E90 = 0
E105 =-1.50 E120 = - 3.89 E135 = - 7.25 E150 =-11.57 E165 = -16.82 E180 = -22.88
90°. It is worth
Evidently (3.11) is technically applicable of 0° << noticing that this formula is exact when Ő is 90°.
3.2 Tiloyapannatti of Yativrşabha (fl. 473-609 C.E.) uses the following formula [8]:
(3.21) A = [10(1h/4)2]1/2
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