Question

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

Answer 1

Answer:

A solid metallic Cylinder has its base of diameter 42cm and it is 2m high. Find cost of painting its curved Surface if it costs 25 .

cost of painting its curved Surface if it costs 25 paise per square centimetre. = Rs . 6600

Answer 2

Answer:

Total cost for painting is ₹ 6600.

Step-by-step explanation:

For a cylinder,

d = 42cm. :. r = d/2 = 42/2 = 21cm

h = 2m = 2 X 100cm = 200cm

$curved \: surface \: area \: of \: cylinder \\ = 2 \times \pi \times r \times h$

$curved \: surface \: area \: of \: cylinder \\ = 2 \times \ \frac{22}{7} \times 21 \times 200$

Curved surface area of cylinder = 26400cm²

For cost of paint,

Rate per square centimetre = 25 paise = ₹ 25/100

= ₹ 0.25

$total \: cost for \: painting \: = curved \: surface \: area \: of \: cylinder \: \times rate \: per \: square$

Total cost for painting = 26400 X 0.25 = ₹ 6600