Editing Disc integration (section)

{{Short description|Integration method to calculate volume}}
[[File:Disc integration.svg|thumb|right|170px]]
{{Calculus |Integral}}
'''Disc integration''', also known in [[integral calculus]] as the '''disc method''', is a method for calculating the [[volume]] of a [[solid of revolution]] of a solid-state material when [[Integral|integrating]] along an axis "parallel" to the [[axis of revolution]]. This method models the resulting three-dimensional shape as a stack of an infinite number of discs of varying radius and infinitesimal thickness. It is also possible to use the same principles with rings instead of discs (the "'''washer method'''") to obtain hollow solids of revolutions. This is in contrast to [[shell integration]], that integrates along an axis ''perpendicular'' to the axis of revolution.