To make a road plain a roller has to complete 750 rounds. If the diame

1.	To make a road plain a roller has to complete 750 rounds. If the diameter of roller is 84 cm and length 1 meter then find the area of road.
Answer» For Rollar Diameter = 84 cm. Radius (r) = 84/2 cm. = 42 cm. Length (h) = 1 meter = 100 cm. ∴ Curved surface area = 2πrh = 2 . 22/7 . 42 . 100 = 26400 cm² ∴ Area of road made plane in one round = 26400 cm² ∴ Area of road = 26400 x 750 = 19800000 cm² = 19800000/10000 m² = 1980 m²

To make a road plain a roller has to complete 750 rounds. If the diameter of roller is 84 cm and length 1 meter then find the area of road.

Answer»

For Rollar

Diameter = 84 cm.

Radius (r) = 84/2 cm. = 42 cm.

Length (h) = 1 meter = 100 cm.

∴ Curved surface area = 2πrh

= 2 . 22/7 . 42 . 100

= 26400 cm²

∴ Area of road made plane in one round = 26400 cm²

∴ Area of road = 26400 x 750

= 19800000 cm²

= 19800000/10000 m²

= 1980 m²