Question

fourteen cylindrical pillars of a building have to be painted. if the diameter of each pillar is 15 cm and height 4 m find the total area to be painted​

Answer 1

Answer:

D=15 cm

R=7.5 cm

H=4m=400cm

Area to be painted=CSA=2*(22/7)*r*h*14

=2*22/7*7.5*400*14

=2,64,000cm2

Step-by-step explanation:

Answer 2

Step-by-step explanation:

d= 15cm

r=7.5cm

h= 4m= 400cm

Pillar are to be painted hence upper and lower circle will nir be counted as one is base and another holds the building. Hence we will find C.S.A of cyl.

C.S.A of cyl= pie×r×r×h

= 22/7 × 7.5 × 7.5 × 400

=70650cm^2.

There are 14 cyl hence , 70650 × 14 = 989100cm^2.

Hope this helps .

Best of luck for your future..