Which of th following statements is true about earthquakes along transform plate boundaries? (a) they are very rare and not very hazardous. (b) they are characterized as being relatively weak earthquakes. (c) they did not take place millions of years ago and a relatively new geologic process. (d) they can have as much as 100 times the energy associated with them of other earthquakes.

(D) They are rare as they are found deep in the ocean they are very dangerous when they do go off though like the san andreas fault which was where one transform plate boundary earthquake went off killed over 600 people, that gets rid of B and A, and they were even erupting over 10 million years ago which gets rid of C and gives you the answer D.

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. 

Answer they are produced by collision of tectonic plates;