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If each grey square is 1cm in width and length, then what is the area of the shape?

The Fact

Pythagoras, the famous Greek mathematician, used to have small rocks to signify numbers while working on mathematical equations. This led to the origin of “calculus,” which means pebbles in Greek.

The man reads mortgage contract at the bank. Staff guy asks him: Well did you learned it? Confused with something? The man: yes, here's 1199 section, 23 article: "To put bank's stamp on debtor's forehead..."