i did'nt know where csa is used and where tsa is use please tell me where it is used
as u know csa means curved surface area so it is used when we need to find the area of a figure without the base or the roof and we find the tsa when we need to find the area of a figure adding the base and the roof.
for eg.
to find the csa of a room we have to find the area of only the four walls
to find the tsa of the same room we have to find the area of the four walls+area of roof and the base