isosceles trapezoid

例句：

1. 1. The triangle has an equal base and height.
   这个三角形的底和高是相等的。
2. 2.The isosceles trapezoid is used to measure the width of a piece of cloth.
   等腰梯形用于测量布料的宽度。
3. 3.The isosceles trapezoid was used as a tool for measuring angles in ancient times.
   等腰梯形在古代被用作测量角度的工具。