no
Postulates Definitions Corollaries
Yes, of course.
theoremPostulates(apex)postulatesdefinitioncollaries
Logically invalid statements.
No
no
conclusion
Postulates Definitions Corollaries
Yes, of course.
theoremPostulates(apex)postulatesdefinitioncollaries
Theorems, definitions, corollaries, and postulates
Logically invalid statements.
Since you didn't include the statements in your question there is no way for us to know
Guess Conjecture
Steps in a geometric proof do not require support
yes