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Tosha · Answer 1 · 2019-12-09T06:20:43+0000

c=√a²+b. square both sides
c²=a²+b². subtract a² from both sides
c²-a² = b². take the square root of both sides
b=±√c²-a²

but since length can never be negative we consider only the positive root
b=√c²- a²

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