Question

A pillar is 30m high , 5m long and 4m wide . find the cost of colouring the pillar at Rs. 5 per 60 sq.m​

Answer 1

Answer:

Dimentions given;

H= 30 m

l= 5m

B=4m

So C. S. A of the pillar is given by

2(L+B) ×H unit ²

C. S. A = 2(L+B) ×H unit ²

C. S. A = 2( 5+4)×30

C. S. A = 18×30

C. S. A = 540 m²

A/Q,

By Applying unitery method we get :-

60 m²= $ 5 { $ = rupess}

1 m² = 5/60

540m² =( 5/60)×540

Total Cost = $ 45

Answer 2

Answer:

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Step-by-step explanation:

since pillar is cylinder and perimeter of cylinder =perimeter of circle × height

since perimeter of circle = pai ×d

and breadth is diameter

therefore perimeter of cylinder = pai × d × height

perimeter of cylinder = 3.14 × 4 × 30

perimeter of cylinder= 376.8 m

376.8/60 × 5 = 6.28 × 5

6.28 × 5 = 31.4