Question

hii friends

plzz solve this question

I give you 50 points


{ NOT SAMP }​

Answer 1

Answer:

Rs 1408

Step-by-step explanation:

The curved surface area refers to the area surrounding the pillar .

The area of cross section is nothing but a circle . Hence the perimeter of the circle and the height are multiplied .

Curved surface area = 2 π r h

h = 4 m

r = 28 cm

➡ r = 0.28 m

There are 25 pillars . So multiply the whole thing with 25 .

Total curved surface area

➡ 25 × 22/7 × 0.28 × 4 × 2

➡ 88 × 2

⇒ 176

Since Rs 8 is for 1 m² , then :

Cost = Rs 8 × 176 m²

➡ Rs 1408

Answer 2

Here is your answer

Given,

Radius of cylindrical pillars

=28cm= 0.28m

Height of cylindrical pillars

= 4m

Number of cylindrical pillars

= 25

Now Remember

Curved Surface area of cylinder(C. S. A)

=

2pie r×h


Total Surface area of cylinder(T. S. A)

=

2pie r×h + 2pie r^2

=2pie r(h+r)


Now, according to the question

Area of the 25 pillars

=
25 (2pie r×h)


=> 25×(2×22×0.28×4)7

=>1232/7

=>176m^2

Now,

cost of painting the 1m^2 area pillars

= Rs8

So, cost of painting the 176m^2 area pillars=>

176×8

=>Rs 1408

Hence cost of pain the pillars are Rs1408.

Thanks