Question

A solid metallic cylinder has its base of
diameter 42 cm and it is 2 m high. Find the
cost of painting its curved surface if it costs 25
paise per square centimeter.​

Answer 1

Answer:

Rs.6597.5

Step-by-step explanation:

curved surface area of cylinder=2πrh

where r=21cm and h=200cm

so 2xπx21x200=26390cm^2

now for 1 cm^2 cost is 25 paise

so for 26390cm^2 it's

26390x25=659750 paise

so divide by 100 to get it in Rs.

659750/100=Rs.6597.5

hope it helps:)

Answer 2

Radius = Diameter÷2 = 42÷2=21 cm

Height = 2m = 200cm

Total surface area of cylinder = 2πrh + 2π(r)²

    ( On taking 2π as common)

                                                = 2π(rh+r²)

                                               = 2π (21×200 + 21²)

                                               = 2π ( 4641 )

                                                = 2 × 22/7 × 4641

                                                = 29172 cm ²

Cost of polishing 1 cm² = 25 paise = 25 / 100 = 1/4 rupees

∴ Cost of polishing 29172 cm² = 1/4 × 29172

                                                   = 7293 rupees

Hope my answer helps you....please mark my answer as brainliest answer