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use pethagoreon theorm.

Example: a=? b=3 c=5

since your trying to find a, your equation would be

a² + 3 ²= 5²

a² + 9 = 25

deriving the formula to get "a"

25 - 9 = 16

a² = 16

√ a = √ 16

a = 4

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