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s= 39 cm
a) t= √(s²-r²)
= √(39²-15²)
= √(1521-225)
= 36 cm
b) luas selumut
= phi . r . s
= 3,14 . 15 . 39
= 1839,9 cm²
c) volume
=1/3 phi r² t
=1/3 . 3,14 . 15² . 36
=8478 cm3