dik = t = 30 cm
d = 18 cm
r = 18:2 = 9 cm
dit = V. topi kerucut?
jwb = V. t. Kerucut = 1/3 π r² t
= 1/3 × 3,14 × 9 × 9 × 30
= 1 × 31,4 × 3 × 9 × 3
= 2543,4 cm³
jadi Volume topi ulang tahun berbentuk kerucut tersebut adalah 2543,4 cm³
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dik = t = 30 cm
d = 18 cm
r = 18:2 = 9 cm
dit = V. topi kerucut?
jwb = V. t. Kerucut = 1/3 π r² t
= 1/3 × 3,14 × 9 × 9 × 30
= 1 × 31,4 × 3 × 9 × 3
= 2543,4 cm³
jadi Volume topi ulang tahun berbentuk kerucut tersebut adalah 2543,4 cm³