A central angle is best described as which of the following? A. It has a measure greater than 180 degrees. B. It is part of the circumference of a circle. C. It is an angle that has its vertex at the center of a circle. D. It is an angle that has its vertex on the circle.

A central angle is an angle that has its vertex at the center of a circle. This unique position allows it to encompass a specific arc of the circle, with its measures directly corresponding to the arc's length. It's a foundational concept in circle geometry that opens the door to deeper topics such as inscribed angles and sector area calculations. In real-world applications, central angles play a pivotal role in fields like architecture and engineering. For instance, when designing circular structures or elements (think domes or stadiums), understanding how these angles work can determine everything from the aesthetics to the structural integrity of the design. So next time you admire a beautifully crafted circular building, remember the central angles helping to hold it together!