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2014-05-26T18:12:44+07:00
V = La. t
    = 16.21.1/2.20
    = 168 . 20
    = 3360cm³
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Iya, sama sama :)
2014-05-26T18:12:58+07:00
La = d1 x d2/2 = 21 x 16/2 = 21 x 8 = 168 cm²
t = 20 cm
V = La x t = 168 x 20 = 3360 cm³