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a. L alas = πr^2
<=> 55 = (22/7) * r^2
<=> r^2 = 55 * (7/22)
<=> r = √ (5*7/2) =√(35/2)
b. V tabung = L alas * t
<=> 11000 = 55 * t
<=> t = 11000/55
<=> t = 200cm 2m
kalau tinggi kezia = tinggi tabung, jadi tinggi kezia 2m