What are three ways that the great barrier reef is important to australia?

The Great Barrier Reef, being the largest reef in the world holds many benificial factors including providing natural resources like food and drugs, it holds massive species diversity anongst a small area, and is a source of nitrogen for marine chains.
The reef is constantly being put in danger due to global warming and poor management- The Australian Government has already contributed 40 mil to the cause of keeping the reef in standardized conditions.

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.