A compass is used in mathematics, drawing and drafting to create arcs, circles or other geometric figures that can be determined by measuring intersecting line segments. A compass can be used to bisect lines, find midpoints and help solve problems in geometry
It has two legs, one with a point and the other with a pencil or lead. You can adjust the distance between the point and the pencil and that setting will remain until you change it.
The correct answer is:
To draw arcs of a given size.
A compass is a tool used to draw a circle. Since an arc is a part of a circle, the most direct use of a compass would be to draw arcs of a given size.
The most direct use of a compass in any geometric constructions are to draw arcs of a given size.