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15) persegi panjang
16.) Luas = πr²
154= 3,14 . r²
r² = 49
r = 7
17.) Luas alas tabung = πr²
314= 3,14. r²
r²= 100
r= 10
volume tabung = πr²t
= 3,14 . 10².25
= 7850 cm³