Correct Answer - Option 4 : 4.2 m
Given
Height of cone = 100 cm
Volume of sand = 18.48 m3
Formula used
Volume of cone = (1/3)πr2h
Where r and h are radius and height of cone respectively
Height = 100 cm or 1 m
Calculation
18.48 = (1/3) × (22/7) × r2 × 1
⇒ √(18.48 × 7 × 3)/(22) = r
⇒ 4.2 m = r
∴ Radius of heap of sand is 4.2 m