English: This is an image of an isosceles triangle of height h, inside is drawn the perpendicular to the base two form a right triangle whose base is labeled R. Inside this right triangle at height x a line parallel to the base is drawn to create a similar right triangle of height h-x and base r.
Created to describe how to fine the radius of a circle created by the cross section at height x of a right circular cone whose height is h and base has radius r.
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{{Information |Description={{en|1=This is an image of an isosceles triangle of height h, inside is drawn the perpendicular to the base two form a right triangle whose base is labeled R. Inside this right triangle at height ''x'' a line parallel to the ba