Which of the following statements best describe why the dead sea's water levels are decreasing?

a.) the dry climate encourages the water to evaporate.
b.) the dead sea is the final destination for the water of the jordan river; there is no outlet.
c.) the extraction of numerous minerals has left the sea at risk of shrinking.
d.) more water is being siphoned off the jordan river for agriculture.

The answer is D because with the need for more cash crops, farmers are planting more cotton and other various crops that consume a large amount of water. The plants are sucking the Dead Sea dry, leaving a desert filled with debris. 

D.) More water is being siphoned off the Jordan River for agriculture. 

This statement is the reason why the Dead Sea's water level is decreasing.

The low level is blamed on the imbalance of the incoming water and the outgoing water. More amount of water is outgoing from the Dead Sea than it has incoming from the Jordan River.  

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.