What is Dimension reduction in Data Mining? Please provide one example and explain why and how you have utilized it in your analysis.

Im gonna fail 7th grade selective breeding 1. creates offspring which are genetically identical to the parent 2. is the process of breeding only organisms with desirable traits 3. involves the removal of the nucleus of a cell 4. combines traits from organisms of different species

What percent of the circle below is shaded?

With number 11 ( show how you got the answer)