Editing Frustum (section)

===Surface area===
[[File:CroppedCone.svg|thumb|Conical frustum]]
[[File:Tronco cono 3D.stl|thumb|3D model of a conical frustum.]]
For a right circular conical frustum<ref>{{cite web |url=http://www.mathwords.com/f/frustum.htm |title=Mathwords.com: Frustum |access-date=17 July 2011}}</ref><ref>{{cite journal|doi=10.1080/10407782.2017.1372670 |first1=Ahmed T. |last1=Al-Sammarraie |first2=Kambiz |last2=Vafai |date=2017 |title=Heat transfer augmentation through convergence angles in a pipe |journal=Numerical Heat Transfer, Part A: Applications |volume=72 |issue=3 |page=197−214|bibcode=2017NHTA...72..197A |s2cid=125509773 }}</ref> the [[slant height]] <math>s</math> is
{{bi|left=1.6|<math>\displaystyle s=\sqrt{\left(r_1-r_2\right)^2+h^2},</math>}}
the lateral surface area is
{{bi|left=1.6|<math>\displaystyle \pi\left(r_1+r_2\right)s,</math>}}
and the total surface area is
{{bi|left=1.6|<math>\displaystyle \pi\left(\left(r_1+r_2\right)s+r_1^2+r_2^2\right),</math>}}
where ''r''<sub>1</sub> and ''r''<sub>2</sub> are the base and top radii respectively.