This may not be too much, but here's my explanation...
Mods, if i am not doing this correctly and you see this just delete the answer i am new to pythagorean theorem.
Answer: 10
Step-by-step explanation: Ok, so let's use the Pyhagorean Theorem of course.
a² + b² = c²
12² + b² = 16²
x + 144 = 246
246 - 144 = 102
b = 102
b = 10
I hope this is what you were looking for, have a good day!
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