Which of the following best describes the impact of glaciers upon the surface of the earth?

They erode the earth, carrying along minerals and soils. When they melt, they deposit these materials, creating other landforms.

They break apart the earth or erode it, causing man made as well as naturally made landmarks to break apart

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. 

They immigrated for religious freedom