A straight line drawn from the center of a circle to its outer edge is called what?

The term for a straight line drawn from the center of a circle to its outer edge is known as the radius. The radius is essential in defining the size of the circle, as it determines the distance from the center to any point on the perimeter. For example, if the radius is 5 units, this means that every point on the circle's edge is exactly 5 units away from the center.

Understanding the radius is important in various applications, including calculating the area and circumference of a circle, which utilize this measurement in their formulas. While diameter, circumference, and chord are all related concepts in circle geometry, they denote different characteristics. The diameter spans the entire circle through the center, the circumference refers to the total distance around the circle, and a chord connects two points on the circle but does not necessarily pass through the center.