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Write math diary (in units of length and area).
I had a dream, in which I circled in a square candy.

Some people say that I can give you all the candy in the area surrounded by your circle, so I circled the largest circle, which is a square inscribed circle.

Square length 10 meter, I got (10/2) 2 * π square meters of candy, which can be distributed to my parents, grandparents, and, by the way, my good friend Xiaoli. It was a good dream, but it was a dream.