Question

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The measure of b is

Answer 1

@AlexandervonHumboldt2 @welshfella

Answer 2

a^2 + b^2 = c^2

You already know a and c.
So substitute them and then find the square root to get to b.

Answer 3

20^2 + b^2 = 29^2

Find the squares and then find the square root of the difference of a^2 from c^2.