The servants cut our bread into cones, cylinders, parallelograms , and several other mathematical figures.
仆人们把我们的面包切成圆锥形、圆柱形、平行四边形和其他一些几何图形。
a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms .
有两个全等平行面（底面）且侧面都是平行四边形的多面体。
After reasoning, one can conclude that these two parallelograms are similar figures.
经过推理，可以得出这两个平行四边形是相似形。
There are so many parallelograms in our daily life. Can you find it?
生活中有很多平行四边形，你能找出来吗？（电脑出示）
Work out the base or the height of the following parallelograms. (Unit: cm)
求下列平行四边形的底或高。（单位：厘米）
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