Question

in a temple there are 20 cylinderical pillars.the diameter and height of each pillar is 0.50m and 4m respectively. find the cost of painting the curved surface area of pillars at the rate of Rs 2.50 per sq.meter

Answer 1

Step-by-step explanation:

C.S.A=2*3.14*0.25*4=6.28

for 20pillar =6.28*20=125.6

so cost 125.6*2.50=314

Answer 2

Answer:

$492.98

I think...

Step-by-step explanation:

Finding surface area(Find area of rectangle only, because that's the curved area.):

Rectangle area: $4\times(\frac{0.5}{2}\times \pi ^2)=4\times 0.25\pi^2=\pi^2$

Now multiply by 20, because there are 20 pillars. So, $20\pi^2$.

Now multiply by rate, $2.50 per every square meter.

$20\pi^2\times 2.5=50\pi^2$

But we don't want the pi around so...pi is about 3.14.

50 times 3.14 squared is $492.98