This is a right triangle, so I'll use the Pytagorean theorem to solve it.
c^2 = a^2 + b^2
c = 8
a = 2
b = ?
Solve for b
b^2 = c^2 - a^2
Substitution
b^2 = 8^2 - 2^2
Simplification
b^2 = 64 - 4
b^2 = 60
b = 7.74 or
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