Question

a cylindrical piller has a diameter of 56cm and its of 35 m high.there are 16 pillers around the building.find the cost of painting the urved surface area of all he pillars at the rate of $5.50per 1 m2

Answer 1

Cost of painting the 16 pillars of the building=curved surface area of 16 pillars*rate of painting per meter^2
pi*d*h*16*5.50
22/7*0.56*35*16*5.50=$5420.80

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