UN L US, Tu
Source: University of Wiscon
Activity 1.11 Using a satellite image
gure 1.25 was taken on 21 June 2011 at 12:00 UTC, or Greenwich Me
00 South African Standard Time, which is based on 30° E. The keybo
be shows the temperatures in celsius [T(C)] of the various colours.
What are the times in Sydney, Australia, longitude 150° E and
Buenos Aires, Argentina, South America, longitude 60° W?​

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. 

Ihave no idea. about. that