Question

plz answer this questions.......
a)the curved surface area of a cylinder is 1000 CM square and the radius of its base is 21 cm and total surface area of the cylinder....?



b) an open cylinder cylinder oil tank has diameter 40m and height 9M inner side of the tank has been printed all over body its cost at Rs 40 per square metre....?



c)the inner diameter of a circular wall is 3.5 M and it is 12 m find the cost of plastering the inner surface at the rate of4per square metres

answer fasy

Answer 1

Here's your answer mate
In Your c part what is 12m

Answer 2

C) diameter=3.5m
radius=3.5/2m
height=12m
LSA of cylinder=2πrh
=2×22/7×3.5/2×12
=2×22×0.5×6
=44×3=132m^2
cost of plastering at per m^2=Rs4
cost of plastering at 132 m^2=Rs(132×4)=Rs528