Question

the diameter of a road roller is 140 cm and its length is 700cm it takes 4500 revolution to level a playground find the area play ground whose which was labelled by the road roller

Answer 1

Answer:

138429 m²

Step-by-step explanation:

The road roller is in the shape of  cylinder

Diameter=140 cm

So radius=70 cm=0.7 m

Height=700 cm=7 m

CSA of the cylinder = 2πrh

                                 =2 × 3.14 × 0.7 × 7

                                 =30.722 m²

Since it takes 4500 revolutions to level the full playground

Area of playground = 30.722 ×4500

                                 =138429 m²