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U3 / a.r^2 = 12
met subtitusi
U3 = a.r^2
12 = 3.r^2
12/3 = r^2
4 = r^2
2^2 = r^2
2 = r
r = 2
U3 = 12 => ar pangkat 2 = 12
ar pangkat 2 per a = 12 per 3
r pangkat 2 = 4
r = 2