Which of these is the best reason for doing more
background research after making an observation
and before forming a hypothesis?
O to find the answer without having to do an
experiment
O
to prevent making the same mistakes made ir
a prior experiment
to fill the space in your lab report
to make your data agree with prior
experiments

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. 

Answera discharge of static electricity;

Drought resistance because they are close to a lot of supplys