What would be the right answer since im stupid

I say:
A tetrahedron is a pyramid with a *triangular* base

She says: A tetrahedron is a pyramid with a *triangle* base

and also (since im stupid again) would it be right if I said The coordinate plane is divided into four *quadrant*

cuz I think it would be better if I added an s

Read the excerpt from black boy wright uses this personal experience to establish

Which line from president reagan’s address sat moscow state university is a fact? a. democracy is the standard by which governments are measured. b. throughout the world, free markets are the model for growth. c. the key is freedom-freedom of thought, freedom of information, freedom of communication. d. every four years the american people choose a new president, and 1988 is one of those years.

Based on how the stage directions are used in this excerpt from act 1 scene 1 of richard iii what was likely the main purpose of providing stage directions in drama