Answer:
The length is 20 in
Step-by-step explanation:
Use Pythagorean Theorem to solve for the length
15^2 + b^2 = 25^2 Simplify
225 + b^2 = 625
-225 - 225 Subtract 225 from both sides
b^2 = 400 Take the square root of both sides
b = 20 in
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