________________
(2.3)
40 = t ab
and the exact perimeter
P.- 41m2 (a’ sin’o + b2 cos?d}"2 do or
1
-
e? Ā
1 32 5?...... (2n - 3) 2 22 42 6? . .(2n)
12 (2n-1ean
(2.4) Po=2
Figure 2: Ellipse
~
acost, tsing)
---ofã--
*
FER(-e)
For very fine approximations of perimeter of ellipse by Ramanujan, refer [11]. The extent to which the perimeter given by (2.1) is valid may very well by judged by computing its percentage of error Ee (see Table 2A):
E, - 18 - 1] x 100 = hotelov . ]x 100 where k = 1-*-- so - 17300 - DE> 10 cm 114 100 ke 1-
32
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