well, a + has four 90 degree angles, so therefore, there are 4 congruent angles, however you can say that any 2 of these angles are congruent.
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It means congruent
It means congruent, which is to say they are approximately equal. Such as 3.9595 is approximately 4. Or, in geometry, two angles are basically the same size and shape but are positioned differently.
First of all, it is spelled perpindicular, not perpandiculer. Secondly, perpindicular lines are two lies that cross forming right angles, or 90 degree angles. For example, the two lines forming a plus sign are perpindicular.
If you mean the ADDITIVE INVERSE, change the minus sign to a plus sign. (And if you see a plus sign, you change it to a minus sign.)
less than or more