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12.56 = 3.14 × 2r
2r = 4
r = 2
volum kerucut = 1/3 × luas alas × tinggi
=1/3 × (3.14x 2x2) × 12 = 4 × 12.56
= 50.24 cm^3 (c)
12,56 = 2. 3,14. r
12,56 = 6,28. r
r = 12,56/6,28
r = 2
V kerucut = 1/3πr²t
= 1/3. 3,14 . 2 .2. 12
=1. 3,14 . 2 .2 .4
= 50,24 cm³ (C)