等腰三角形是一种特殊的三角形,它具有普通三角形的一切性质,同时还有自己的特性。所以在某些图形中,若能构造出合适的等腰三角形,利用等腰三角形的性质及其判定,往往能使问题迎刃而解。一、作腰构造等腰三角形1.如果题目中出现直角三角形斜边上的中点,常作出斜边上的中线,构成 An isosceles triangle is a special kind of triangle. It has all the properties of an ordinary triangle and also has its own characteristics. Therefore, in some graphs, if we can construct a suitable isosceles triangle, using the nature and determination of isosceles triangles can often solve the problem. First, for the waist structure isosceles triangle 1. If the subject appears in the middle of the hypotenuse of the right triangle, often made on the hypotenuse of the midline, constitute