Final answer:
The question lacks sufficient information to determine the measure of arc AC. Normally, the measure of an arc is determined by the angle subtended at the center of the circle by the arc. Without additional details or a diagram, the question cannot be accurately answered.
Step-by-step explanation:
The student's question likely refers to a geometry problem involving a circle with center at point D and an arc AC. However, there is not enough information provided to directly answer the question regarding the measure of Arc AC (often represented symbolically as arc AC) or the measure of angle AOC, where O is the center of the circle. Normally, you could calculate the measure of an arc by knowing the central angle that subtends it. Since the measure of a full circle is 360 degrees, a pro-rata part of that, determined by the ratio of the central angle to 360, would give the arc length or degree measure, when dealing with angles.
Without additional context or a figure to reference, we cannot solve for the exact measure of arc AC with the information provided. Typically, in geometry, if we knew angle AOC that subtends arc AC, we could directly say that the measure of arc AC is equal to the measure of angle AOC in degrees.