Question

a cylinder pillar has a diameter of 56 metres and is of 35m high there are 16 pillars around the building of find the cast of painting the curved surface area of all the pillars at the rate of 5.50per 1msquare

Answer 1

CSA of 1 pillar = $\pi$ X $r^{2}$ X h
                        = 22/7 X 28 X 28 X 35
                        =22 X 784 X 5
                        =110 X 784
                        =86240$m^{2}$
CSA of 16 pillars = 16 X 86240
                            = 1379840
Cost Of Painting= 1379840 X 5.50
                          = Rs 75,89,120

Answer 2

$<b><i>$Given,

A cylindrical pillar, diameter = 56cm = 0.56m

i.e. r = 0.28cm

Height h = 35m

Number of pillars n = 16

Curved surface area of a pillar = 2πrh

= 2 × 3.14 × 0.28 × 35

= 61.54cmCurved surface area of 16 pillars = 16 × 61.54

= 984.64cm2

Cost of painting = 5.5 × 984.64

= 5415.52