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In a triangle a=20 and c=29 but how long is side b ?

In a triangle a=20 and c=29 but how long is side b ?-example-1

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a^2+b^2=c^2
20^2+b^2=29^2
400+b^2=841
-400. -400
b^2=√441
b=21
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User Augustzf
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