Question

For circle O, name all of the arcs shorter than a semicircle.
A circle with center O is drawn. Points B and C are on the circle at the ends of a line segment that passes through center point O. To the right of point B on the circle is point A. At a distance to the left of point B that appears approximately equal to the distance between points B and A on the circle is point D.
A. A list of 5 arcs is shown.
modifying above upper D upper A with convex-arc
modifying above upper D upper B with convex-arc
modifying above upper D upper C with convex-arc
modifying above upper A upper C with convex-arc
modifying above upper A upper B with convex-arc
B. modifying above upper B upper D upper C with concave-arc comma modifying above upper D upper B with concave-arc comma modifying above upper D upper C with concave-arc comma modifying above upper A upper C with concave-arc commamodifying above upper A upper B with concave-arc comma modifying above upper B upper A upper C with concave-arc
C. A list of 5 arcs is shown.
modifying above upper D upper A with convex-arc
modifying above upper D upper B with convex-arc
modifying above upper D upper A upper C with convex-arc
modifying above upper A upper C with convex-arc
modifying above upper A upper B with convex-arc
D. modifying above upper D upper B with concave-arc comma modifying above upper D upper C with concave-arc comma modifying above upper A upper C with concave-arc comma modifying above upper A upper B with concave-arc

Answer 1

comma modifying above upper B upper A upper C with concave-arc