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t tabung = t kerucut = 15 cm
r tabung = r kerucut = 8 cm
s² = r² + t²
s² = 8² + 15²
s² = 64 + 225
s² = 289
s = √289
s = 17 cm
no 3
d = AO+OB
= 10 + 10
= 20 cm