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r = 27 - 20
r = 7 cm
t = 20 cm
Volume = πr²t + ½ x 4/3πr³
= πr² x ( t + ⅔r)
= 22/7 x 7² x ( 20 + 14/3)
= 154 x (60+14)/3
= 154 x 74/3
= 11.396/3
= 3.798,67 cm³
10)
tinggi tabung = 40 - 20 = 20 cm
d = 20 cm
r = 20/2
r = 10 cm
Volume = πr²t + 4/3πr³
= πr² x ( t + 4r/3)
= 3,14 x 10² x ( 20 + 40/3)
= 3,14 x 100 x ( 60+40)/3
= 314 x 100/3
= 31.400/3
= 10.466,67 cm³