Theorem 72. Each pair of opposite sides of a parallelogram are con- gruent. Given a parallelogram DABCD, we choose any side-say AD-as the base side and define b to be the length of AD. By Theorem 63 we can define the height of OABCD (relative to this choi

匿名用户 最后更新于 2021-12-01 19:14 数学类Mathematics

Theorem 72. Each pair of opposite sides of a parallelogram are con- gruent. Given a parallelogram DABCD, we choose any side-say AD-as the base side and define b to be the length of AD. By Theorem 63 we can define the height of OABCD (relative to this choice of base) to be the constant distance h between the parallel sides AD and BC.

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