#15. square
step-by-step explanation:
because quadrilatural (idk how to spell it) means somthing that is not 3d or like, equal sides (or somthing like that you know what i meanz)
hope this halps!
bai!
the answer is 1/4
the answer is 2/54
r = 78539458390583095803458309458039485093485 or just 3