Conditions in the south pacific during the la nina phase of enso, in comparison to the neutral phase of enso, include (choose all that apply):

a. sea surface temperatures in the eastern pacific are cooler
b. air pressure patterns reverse from the normal direction
c. easterly trade winds decrease in strength, or reverse to westerly
d. the prevailing rain pattern shifts west towards australia
e. easterly trade winds are stronger
f. upwelling on the west coast of south america is stronger

a. sea surface temperatures in the Eastern Pacific are cooler.b. air pressure patterns reverse from the normal direction.d. the prevailing rain pattern shifts west towards Australia.e. easterly trade winds are stronger

Explanation:

The El Nino and the La Nina are associated with the warm and the cool period of the ENSO system. And both affect the air and the water. During the La Nina conditions, the easterly trade winds are formed at the equator and get stronger than they usually are and thus these winds push the water in the western pacific and the cool water appears to form the eastern pacific.

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. 

The beach , myrtle beach sc