The black soil that the nile left on the flooded egyptian land was called
a. silt
b. mud
c. moss
d. fertilizer

The black soil that the Nile left on the flooded Egyptian land was called silt. The correct option among all the options that are given in the question is the first option or option "a". The black soil was rich in minerals and was ideal for farming. I hope the answer helps you.

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.