Answer:
16
Explanation:
We have to use the pythagorean theorem here
a^2+b^2=c^2
12^2+b^2=20^2
144+b^2=400
b^2=256
By applying the Pythagoras theorem we get,
20*20 - 12*12 = c*c
256=c*c
c=
c=16
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