Answer:
27 rods are made
Explanation:
the volume (V) of a cylinder is calculated as
V = πr²h (r is the radius and h the height )
given diameter = 4 cm , then r = 4 ÷ 2 = 2 cm and h = 90 cm
substitute these values into the formula for V
V = π × 2² × 90 ( using 3.14 for π )
V = 3.14 × 4 × 90 = 1130.4 cm³
Now divide the volume of steel used by the volume of one cylinder
rods made =
= 27