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Verified answer
Bab Bangun RuangMatematika SMP Kelas VIII
r = 3 m
= 30 dm
Kerucut
Volume = 37,68 liter
(1/3) . π . r . r . t = 37,68
(1/3) . 3,14 . 30 . 30 . t = 37.680
t = 37.680 : (3,14 . 300)
t = 40 dm
s = √(r² + t²)
= √(30² + 40²)
= √(900 + 1.600)
= √2.500
= 50 dm
Luas bahan = π . r . (r + s)
= 3,14 . 30 . (30 + 50)
= 3,14 . 30 . 80
= 7.536 dm²