He convergence of tropical trade winds at the has a great impact on the climates throughout the tropics. 30-degree latitude line southern ocean intertropical convergence zone antarctic circle

Inter tropical Convergence Zone

Explanation:

Its also known as the doldrums region of the clams as due to the monotony and windless weather. Here the northeastern and southern eastern trade winds converge. It encircles the earth near the thermal equator and is located at a latitude of 30 degrees in the tropics and though it varies seasonally. And is also refers to as the monsoon through.

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 investiture controversy began as a power struggle between pope gregory vii (1072–85) and henry iv, holy roman emperor (1056–1106).[2] a brief but significant struggle over investiture also occurred between henry i of england and pope paschal ii in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in france, as well.by undercutting the imperial power established by the salian emperors, the controversy led to nearly 50 years of civil war in germany, and the triumph of the great dukes and abbots. imperial power was finally re-established under the hohenstaufen dynasty. historian norman cantor: