How many titles are listed in the dictionary of occupational

13,000 different types of work, from 1938 to the late 1990s i think

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.