r = 7 ÷ 2 = 3,5 cm
Volume kerucut
= 384,65 cm³ (A.)
r = 20 ÷ 2 = 10 cm
Tinggi kerucut
= 3v ÷ πr²
= 3 × 1.884 cm³ ÷ (3,14 × 10 × 10)
= 5.652 cm³ ÷ 314 cm²
= 18 cm (D.)
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No. 11
r = 7 ÷ 2 = 3,5 cm
Volume kerucut
= 384,65 cm³ (A.)
No. 12
r = 20 ÷ 2 = 10 cm
Tinggi kerucut
= 3v ÷ πr²
= 3 × 1.884 cm³ ÷ (3,14 × 10 × 10)
= 5.652 cm³ ÷ 314 cm²
= 18 cm (D.)