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(360-72)/360 × 2 × 314/100 × 10 = 314/100 × 2 × r
<=>288/360 × 2 × 314/100 × 10 = 2 314/100 × r
<=> 288/360 × 10 = r
<=> 8 = r
• Tinggi Kerucut = Phytagoras 8 dan 10 = 6 cm
• Volume Kerucut
1/3 × pi (3.14 atau 22/7) × r^2 × t
= 1/3 × pi × 64 × 6 = 128pi