1.
the base of a triangle, pyramid, etc
三角形的底边、 角锥体的底面等.
2.
The base of the triangle coincides with one side of the square.
这三角形的底边与这四边形的一边相重合。
3.
Line AB is the base of the triangle ABC.
AB线是三角形ABC的底边。
4.
The point on a triangle or pyramid opposite to and farthest away from its base.
角顶三角形或者角锥的与其底边相对且具底边最远的顶点
5.
triangular pediment
成等边三角形的三角墙
6.
a three-sided regular polygon.
有三条边的等边多角形。
7.
The side of a triangle subtends the opposite angle.
三角形的边对着对角
8.
the angle contained by two sides of a triangle
三角形两边的夹角.
9.
a triangular figure; a triangular pyrimid has a triangle for a base.
三角形；三角形的金字塔有一个三角形的底部。
10.
a prismatoid whose bases are polygons having the same number of sides and whose other faces are trapezoids or parallelograms.
每个底部是边数相同的多面形且其它面是不等边四边形或平行四边形的旁面三角台。
11.
The hypotenuse is the longest side of a right triangle.
直角三角形的斜边是直角三角形中最长的边。
12.
a prism whose bases are triangles.
底面是三角形的棱柱。
13.
A triangular pyramid.
三角形底面的金字塔
14.
a polyhedron having a polygonal base and triangular sides with a common vertex.
有一个多边形底面和有一个共同顶点的三角形侧面的多面体。
15.
The side AB is the shortest of the three sides of the triangle ABC .
边AB是三角形ABC三个边中最短的边。
16.
an equilateral triangle
等边三角形,正三角形
17.
(of a triangle) having two sides of equal length.
（三角形）有二等边的。
18.
a triangle with two equal sides.
有两条边相等的三角形。