6. The radius of the base of cylindrical column of a building is 25 cm

1.	6. The radius of the base of cylindrical column of a building is 25 cm and its height is 3.5m. It costs 20 per sq. m to paint this column. What will it cost to paint 30 such columns?(ar 22
Answer» Given, Radius of column r = 25 cm=.25 mHeight of column h = 3.5 m Surface area of cylindrical column = 2pirh= 222/7.253.5= 443.5.25/7= 5.5 m^2 Then, Surface area of 30 cylindrical column = 305.5 = 165 m^2 Therefore, Cost to paint 30 columns = 16520= Rs 3300

6. The radius of the base of cylindrical column of a building is 25 cm and its height is 3.5m. It costs 20 per sq. m to paint this column. What will it cost to paint 30 such columns?(ar 22

Answer»

Given, Radius of column r = 25 cm=.25 mHeight of column h = 3.5 m

Surface area of cylindrical column = 2*pi*r*h= 2*22/7*.25*3.5= 44*3.5*.25/7= 5.5 m^2

Then, Surface area of 30 cylindrical column = 30*5.5 = 165 m^2

Therefore, Cost to paint 30 columns = 165*20= Rs 3300