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

Used for an event that has been completed before the present moment in time. simple past past perfect perfect progressive past perfect progressive

Namerican born chinese, the main characters, the monkey king, danny, and jin wang have conflict because they:

Lots of elementary school kids play sports after school. they play soccer, tennis, football, baseball, and even lacrosse. but i think that another great way to spend the afternoon is by playing a non-physical activity: chess. at our school we have a chess club that meets every week to play games and to learn about chess-related issues. chess is a wonderful game for many reasons. chess teaches students to be patient and not rush decisions. chess also teaches students how to strategize their future plans. and finally, chess teaches students the importance and necessity of sacrifice. chess can teach students just as much as any other sport. which sentence could best be added to this paragraph as a supporting detail? a) chess is not as fun as playing a sport outdoors might be. b) my father is very good at chess and plays a game with me every night. c) chess teaches students to think ahead about the consequences of their actions. d) other activities that are as fun as chess are painting, drawing, dancing, and acting.