Answer:
Diameter = 8 cm
Radius = 8/2 = 4 cm
Height = 12 cm
Volume of cone = 1/3πr^2h = 1/3 (4)^2 × 12π
= 64π cubic cm
Radius of lead = 4mm = 0.4 cm
Volume = 4/3πr^3 = 4/3 × (0.4)^3π = 0.256/3π cubic cm
Total number of balls = 64π÷ 0.256/3π = 750
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