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The diagonal length of the diamond block is 20 cm. What is the side length? Please give the mathematical formula of this problem. Thank you.
A:

Diagonal lines of diamonds are perpendicular to each other and are divided into two parts.

If the diagonal is equal to 20 cm, the diamond is a square.

So: square side length a satisfies area S=a? =20×(20÷2)÷2×2=200

So: the side length of a square is 10√2 cm.