The answer is (it can be curved) because it's doesn't have to cross the origin and it's a U shape so it can't look like a straight line and it doesn't have a constant rate of change. :)
t=D/r
Divide r by both sides to get t by itself.
Yes it will fit
Step-by-step explanation:
the square rug is 
so each side is
and the bedroom is 
so it will fit