Question

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Answer 1

Answer:

Concentric circles are circles with a common center. The region between two concentric circles of different radii is called an annulus. Any twocircles can be made concentric by inversion by picking the inversion center as one of the limiting points.

Explanation:

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Answer 2

Answer:

Science is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe. The earliest roots of science can be traced to Ancient Egypt and Mesopotamia in around 3000 to 1200 BCE.