Given the annual range in solar radial ides in the table above, which latitude should have the greatest range in annual temperature thighest temperature each year compared to lowest temperature each year)? why?

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. 

A,b,c is the answer to the question

Ba rock that formed 1,400 million years ago!

100% tortilla. it is the only possible answer