Which is best to use in order to find the straightest distance between two far distant points on the earth?
a flat map
b great circle
c official roadmap

when the chinese communist party took power in 1949, it began to build new di and levees to hold the yellow and yangtze rivers back.

if he does not use open the compass the a width greater than half of po, he will not be able to find the midpoint of the line, without the midpoint of the line, he will not be able to bisect the line.   to find the midpoint of a line the circles drawn with a compass must either intersect or be touching.