Thread: geometry

I have being asked to state the negation of: All right angles are congruent to one another.
I just wan to know if this is right:
There exist a right angle which is not congruent to one another
or
There exist a right angle and is not congruent to one another

Originally Posted by Green03

I have being asked to state the negation of: All right angles are congruent to one another.
I just wan to know if this is right:
There exist a right angle which is not congruent to one another
or
There exist a right angle and is not congruent to one another

Why not say "No right angles are congruent to one another"?