“底边”的拼音为：dǐ biān...

AB线是三角形abc的底边.Line AB is the base of the triangle ABC.这个三角形,底边的长度是20厘米.The base line of this triangle is 20 centimeters long.这三角形的底边与这四边形的一边相重合.The base of the triangle coincides with one side of the square....

“底边”的英语可以翻译为：[数]base，bottom margin，hemline ...