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-×π×r×r×t itu rumusnya
3. hitung sendiri ya Jangan manja
1.914 =22/7 ×21×s
1.914 = 66 s
s = 1914/66 =29 cm
t²= s²-r²
=29²-21²
=841-441
=400
t =√400 =20 cm
V.kerucut =1/3πr²t
=1/3 × 22/7 ×21×21×20
= 9.240 cm³
semoga membantu ya :)