Choices: largest tallgrass preserve; state rock found; one of the largest wildlife refuges; lumber industry Match Them With: Ouachita Mountains; Wichita Mountains; Sandstone Hills; Red Bed Plains

answer: the answer is a 60

explanation:

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.