1.什么是等腰三角形?答:有两边相等的三角形叫做等腰三角形.把相等的两边都叫做腰,另外一边叫做底边,两腰的夹角叫做顶角,腰和底边的夹角叫做底角,所以一个等腰三角形中,有两条腰,一个底边,一个顶角,两个底角.2.等腰三角形有什么重要性质?答:等腰三角形有下列一些重要性质:(1) 1. What is an isosceles triangle? A: There are triangles with equal sides called isosceles triangles. The equal sides are called waists, and the other side is called the bottom edge. The angle between two waists is called the top angle, and the angle between the waist and the bottom edge. This is called the bottom corner, so in an isosceles triangle there are two waists, one bottom edge, one top corner, and two bottom corners. 2. What are the important properties of isosceles triangles? A: Isosceles triangles have the following important properties: (1)