Final answer:
The correct answer is d) concentric. Concentric circles are circles that share the same center but have different radii.
Step-by-step explanation:
The correct answer is d) concentric.
Concentric circles are circles that share the same center but have different radii. In other words, they are circles that are nested inside each other. Concentric circles can be thought of as a target, with each circle representing a different distance from the center.
For example, a dartboard is made up of concentric circles. The bullseye is the innermost circle, while the outer circles represent different scoring zones.