Which of the following issues is not a response to water crises in the Middle East? A. eliminating all restrictions on water use
B. installing new water treatment plants
C. creating policies to reduce overuse
D. researching the use of desalination

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. 

Answergoogle earth; i believe this is the correct answer, plz check first;

Cpopulation density

Asmall closed hole formed in an outwash plain or moraine. forms when a  glacier retreats then remains stationary.