Concept:A divider is a geometric tool with two sharp-pointed legs used for measuring and comparing lengths.Explanation:The divider looks like a compass but has two sharp points. It cannot draw circles or angles. Its main use is to measure the distance between two points. You can transfer that distance to a scale or ruler to find the exact length. It is also used to compare whether two line segments are equal. Thus, the divider helps to find the length of a line segment.Answer:D. to find the length of line segment