In order to analyze the containment measures of axisymmetric convex domains, this paper takes the isosceles trapezoid as an example. The generalized support function and restricted chord function of an isosceles trapezoid domain are obtained by employing generalized French equation of a straight line. Based on these, the containment measure of an isosceles trapezoid domain is derived without the constraint that the height of an isosceles trapezoid does not exceed its shortest base edge is omit...