Question

A dome of the building is in the form of a hemisphere from inside it was white washed at the cost of rupees 49 8.96 at the cost of the whitewashing is rupees 2500 per square metre find the inside service

Answer 1

Answer:

Step-by-step explanation:

Dome of building is painted from inside;

Its like to paint the curve surface area of hemisphere dome;

Total cost of white washing is 2500;

And the per sq. m. cost of the whitewash = 498.96;

So,

Total cost of the whitewashing = Curve Surface area* Per sq. m. cost of white wash;

2500 = 2$\pir^{2}$*498.96

(Curve surface area = 2$\pir^{2}$)

Solving this;

we get

r = 0.9 m

So the inside service area of dome = 2$\pir^{2}$;

= 5.08 sq. m.