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a=8
U50=204
U50 = a+(n-1)b
204 = 8+ 49.b
196 = 49.b
b = 4
Sn = (n/2) (2a+(n-1)b)
S50 = 25 (16+49.4)
=25.212
=5300 cm
U50 = 204 cm
Sn = 1/2n (a+Un)
S50= 1/2x50(8+204)
S50= 25 (212)
S50= 5300 cm --> 53m
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