Sagot :
Answer:
Concentric circles are circles with a common center. The region between two concentric circles of different radii is called an annulus.
Answer:
Venn Diagram
Explanation:
Venn diagram is an illustration that uses circles to show the relationships among things or finite groups of things. Circles that overlap have a commonality while circles that do not overlap do not share those traits. Venn diagrams help to visually represent the similarities and differences between two concepts.
(investopedia.com)