Question

the daiameter and length of a rollar are 84cm and 120cm respectively the rollar revolvs 500 times to cover a field one time find the area of the field

Answer 1

Hi !!!

Here is your answer,

Given : -
Diameter = 84cm
height = 120cm

radius = Diameter/2

radius = 84/2 = 42cm

C.S.A = 2πrh
= 2*22/7*42*120
= 31680

C.S.A = 31680 cm square.


1 revolution = 31680 cm sq.

500 revolutions = 31680*500
= 15840000 cm sq.

( 1 m sq. = 10000 cm sq. )

15840000/10000 = 1584 m sq.


Hope it helps.