Question

A cylindrical pillar is 50cm in diameter and 3.5m in height .find the cist of painting the curved surface of the pillar at the rate if 12.50perm²

Answer 1

diameter = 0.5 m.
radius = 0.5/2 m
height = 3.5 m
            c.s.a of cylinder = 2 pie r*h
                                       =2*22/7*0.5/2*3.5 
                                       =5.5 m sq.
 now cost of 1 m sq = 12.50
         cost of 5.5 m sq.= 12.5 *5.5
                                    = 68.75 ruppes.

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Answer 2

HI

Daimeter = 50cm

Radius = 25cm

Converting Cm to Meter = 25/100 =.25

CSA of cylinder = 2πRH

2x22/7x.25x3.5 =  22x.25

22 x.25 = 5.5

Cost of painting = 12.50 x 5.5 = 68.75