Keliling kerucut 132 dan tinggi 10. Berapa volume kerucut jika phi 22/7

keliling alas = 22/7 . d
132 = 22/7 . d
d = 132 . 7/22
d = 42 
r = 21

Volume  = 1/3 ∏ r2 t
v = 1/3.22/7.21.21.10
v = 4620 cm³

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