Pollution is a group of answer choices problem that is entirely unrelated to the parable called the tragedy of the commons. problem that cannot be remedied with regulations or corrective taxes. negative externality that can be viewed as a public-goods problem. negative externality that can be viewed as a common-resource problem.

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. 

Ibelieve that would be a