Answer
$$10$$
Work Step by Step
Use the Pythagorean Theorem
$$c^{2}=a^{2}+b^{2}$$
with $a=6$ and $b=8:$
$$c^{2}=6^{2}+8^{2}=36+64=100.$$
Take the square root of both sides
$$c=\sqrt {100}=10.$$
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