consider a cylinder..SA is the whole area of the surface of the cylinder including the circles at the two ends..while LSA is only the area of surface of walls excluding the two circles..
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you have first to know the thermal conductivity of PPR that you are dealing with. normally, this is in range between 0.1 to 0.24 W/MK .then you apply this formula Q(IN WATTS) =Thermal Conductivity/MK)*A( surface area for the pipe M2 )temperature difference between fluid inside pipe and temprture of pipe surface K)/(thickness of the pipe M)
Curved surface area of a cone = pi*radius*slant length
Differential calculus is concerned with finding the slope of a curve at different points. Integral calculus is concerned with finding the area under a curve.
The answer will depend on shape in question.
Surface Area (Sphere_ = 4 X pi X r^(2) = 4pi r(2) Volume (sphere) = (4/3)pi r^)3)