Which of the following best explains the importance of forests as a renewable resource?

a.
forests provide a source of recreation for humans.
b.
forests can be cut down and the land used for agriculture and industry.
c.
forests protect the atmosphere by constantly supplying it with oxygen.
d.
forests can easily be cut down to make room for growing human populations.

B. Because when trees are cut down for agricultural purposes and industrial purposes, it serves as a source of fuel for the use and also as product in manufacturing of all furnitures, and other things.

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. 

Its led to migrationits led to death