Question

find the area of road rolled by roller in 100 revolution whose diameter is 84 cm and length is 105 CM

Answer 1

Step-by-step explanation:

As it is roller , it's shape is cylinder.

area rolled in one revolution = CSA of cylinder

2× pie × r × h = 2×22÷7×42×105 ( as d=84, r= 42)

= 44×6×105

=27720 cm

area covered in 100 revolution = CSA ×100

=27,72,000 cm

Answer 2

Answer:

AREA OF ROAD IS 2772000 square cm

Step-by-step explanation:

GIVE

DIAMETER OF ROLLER =84 cm

so, radius of roller =42cm

LENGTH OF ROLLER=105cm

AREA OF ROAD =100×curved surface area of roller

AREA OF ROLLER =100×2πrh

=100×2×22÷7×42×105

= 2772000 square cm

=277.2 square metre