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sudut = 288°
r=sudut/360 × s
r=288/360 × 15
r=12 cm
t²=s²-r²=15²-12²=225-144=81
t=√81=9 cm
V=⅓πr²t
V=⅓×3,14 ×12×12×9
V=1356,48 cm³