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Quadrangle has four sides four angles and is ten letters long.
it has 7 letters
Pythagoras
The dollar sign is to tell the reader that the number that follows in a monetary number. It is a writing convention that people use to separate pure numbers from numbers that are dollars and cents. It is not a consistent convention in that we write $10 and read it as ten dollars instead of dollars ten, but we write 10¢ and read it as it is written ten cents. Consistent or not, it is a convention that is followed here in the United States anyway.
Ten