Help me please ?! Finding coordinates of vertices of polygons. What’s A and B ?

Answer:
A is (0,-s) and B is (r, 0)
Step-by-step explanation:
Assuming this is symmetrical, point A and point B are direct opposites from the points on the same axis as them
So point A has the same distance from (0,0) as point C.
Lets say point C is (0, 5). That would make point A (0, -5) because it has the same distance from (0,0) as does C, and theyre direct opposites.