Answer:
5
Explanation:
b = sqrt( a^2 - b^2)
a = 13 and c = 12
b = sqrt( 12^2 - 12^2)
b = sqrt( 169 - 144)
= sqrt( 25)
= 5
Replace a and c with their values;
b = sqrt(13^2 - 12^2)
b = sqrt(169 - 144)
b = sqrt(25)
b = 5
Answer: b = 5
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