Question

a cylindrical light house of radius 3m and height 21 m to be painted outside leaving its roof at a rate of rs 50 per m square find total cost of painting​

Answer 1

Answer:

=rs. 19800

Step-by-step explanation:

csa =2πrh

=2*22/7*3*21

=2*22*3*3

=44*9

=396m square

cost =396*50

=rs. 19800

Answer 2

Hey Buddy

Here's The Answer

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Cylinder light house

=> Radius ( r ) = 3m

=> Height ( h ) = 21m

It has to be painted painted outside leaving roof, so we need to find the curve surface area ( CSA ).

=> CSA = 2 π r h

=> CSA = 2 × ( 22/7 ) × 3 × 21

=> CSA = 2 × 22 × 3 × 3

=> CSA = 44 × 9

=> CSA = 396 m²

Now, we have to find the cost of painting it at Rs 50 per m².

We know cost of painting 1 m² is Rs. 50, So cost for painting 239 m²

=> Cost = 396 × 50

=> Cost = Rs 19,800

So, cost of painting outer area of light house will be Rs 19,800.

Hope It Helps.