Question

The diameter of a road roller is 80cm and it is 1.20meter long What is the area of levelled surface when rolls once

Answer 1

Answer:

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Step-by-step explanation:

d = 80cm                                                          h = 1.2m

⇒ r = 40cm                                                          = 120cm

CSA = 2π rh

        = 2 * 3.14 * 40 * 120

         = 314 * 8 * 12

         = 30144cm²

         = 3.0144m²

Answer 2

Area of leveled surface when rolls once=3.02 square meter

Step-by-step explanation:

Diameter of road roller=d=80 cm

Radius of roller=r=$\frac{d}{2}=\frac{80}{2}=40 cm=\frac{40}{100}=0.4m$

1 m=100 cm

Length of roller=1.2 m

Curved surface area of cylinder=$2\pi rh$

Where r= Radius of cylinder

h=Height of cylinder

$\pi=\frac{22}{7}$

Using the formula

Area of leveled surface when rolls once=$2\times \frac{22}{7}\times 0.4\times 1.2$

Area of leveled surface when rolls once=3.02 square meter

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