Problems related to concentric circles

Problems related to ages

For two concentric circles.

Concentric circles have

Problems related to numbers

Problems related to percentages

Problems related to combinations of figures (semi-circle+ rectangle/square/triangle)

Problems related to combinations of figures (circle+ rectangle/square/triangle or rectangle/square + triangle)

Problems based on circle

CONCENTRIC CIRCLES Circles having the same centre but with different radii are said to be concentric circles.

What are environmental problems related to atomic reactors?