Which of the following statements best characterizes how developed and developing countries impact the environment?

A. Neither developed nor developing countries have had a significant impact on the environment
in the past century.

B. Developed countries have tended to improve the environment, while developing countries
have tended to damage it.

C. Developed countries have damaged the environment, while developing countries have had
little impact

D. Both developed and developing countries have had significant negative impacts on the
environment.

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.