Final answer:
1. Option C, AC, is a segment that is a radius and is 15 cm long. 2. Option B, CG, is a segment that is a diameter and is 15 cm long
Step-by-step explanation:
A radius within a circle is defined as a line segment linking the circle's center to any point situated on the circle itself.
The line segment identified as a radius is denoted by AC, extending from the circle's center to a point on its circumference.
The specified length of this radius measures 15 cm.
Conversely, a diameter is described as a line segment that traverses the circle's center, connecting two distinct points on the circle.
The line segment recognized as a diameter corresponds to CG.
This diameter extends from one point on the circle to another, passing through the circle's center.
Understanding these geometric principles aids in distinguishing between radius and diameter segments within the context of the given circle and its associated options.
Hence, 1. Option C, AC, is a segment that is a radius and is 15 cm long. 2. Option B, CG, is a segment that is a diameter and is 15 cm long.