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14175 = 1/3 x s x s x tl
14175 = 1/3 x s x s x 21
14175 = s x s x 7
s2 = 2025
s = 45 cm (rusuk alas limas)
14.175 = 1/3 x s² x 21
14.175 = 7 x s²
s² = 2025
s = 45