2. All of the following were crucial to the emergence of the first cities EXCEPT
(A) an agricultural surplus
(B) a stratified social system
(C) labor specialization
(D) a system for food storage and distribution
(E) separation of the ruling system and the religious
system

I'm pretty sure there's a geometry rule for   anyways, if the triangle is equilateral, and the circle is circumscribed, the circle is outside of the triangle.  to find the area, you need the radius.  the radius should be a straight line from the center of the triangle to any of it's points.  draw lines from the center of the circle to each of the triangle points.  draw three more lines from the center to the middle of the sides of the triangle.  you should now have six separate 30-60-90 triangles inside of your original triangle. use your 30-60-90 rules to solve for the radius, then the circumference. 

To relate to humans in a relational humanly way. 

Hey there! something that is given up as the result of a choice is referred to as  a decisionwhen you have a choices that are being refereed, this would mean that this would be a decision.~jurgen