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设有原命题，其逆命题即是将原命题中的前提与结论互换。设原命题为“若A则B”，那么逆命题为“若B则A”。例1．原命题：三角形中若两边相等，则其讨角亦等。（真）逆命题：三角形中若两角相关，则其对边亦等。（真）例2．原命题：老四边形为菱形，则其对角线互相垂直。（真）
With the original proposition, the inverse proposition is to exchange the premise and conclusion in the original proposition. Set the original proposition as “If A then B”, then the reverse proposition is “If B is A”. example 1. The original proposition: if the two sides are equal in a triangle, the angle of discussion is also equal. (True) Contradictions: If the two corners of a triangle are related, then the opposite side is equal. (True) Example 2. The original proposition: The old quadrilateral is a diamond shape, and its diagonal lines are perpendicular to each other. (true)