It is given in the question that,
Diameter = 84 cm
Hence,
Radius = 42cm
Length = 1m = 100 cm
Now,
Lateral surface area = \(2\pi rh\)
= \(2\times\frac{22}{7}\times42\times100\)
= 26400 cm2
Hence, the area of the road will be
= lateral surface area × no. of rotations
= 26400 × 750
= 19800000 cm2
= 1980 m2