Please help Which sides are perpendicular to side j in this square?

Select each correct answer.

side k

side m

side n

well if it's a square then all sides should be the same

a) 0.25x times 3. (could be wrong on equation.)

b) 2.25 pound of dark chocolate. (can i eat all the chocolate? plz? anyway, again, could be wrong, but i hope im right. all the chocolate together should be 5.25 pounds)

have a good day!