Jawabanmu

2014-08-12T15:22:32+07:00
V2^2 × 8^2 × 5^2 = 20Va
2×8×5 = 20Va
80 = 20Va
20Va = 80
Va = 80/20
Va = 4
a = 4^2 = 16

Note : V = Akar , ^=Pangkat
*maaf banyak editan
2014-08-12T15:27:25+07:00
2 x 16 x 25=20√a
3200=20√a
√a = 3200/20
√a = 160
a=√160