x=10
Here's how!
Use Pythagorean theorem, which is a^2+b^2=c^2, and only applies to right triangles.
Rules: 'c' is always your hypotenuse! (Longest side) Your 'a' and 'b' are your legs (the other two sides.)
Plug in your information-
a^2+b^2=c^2
8^2+6^2=x^2
Solve!
64+36=x^2
100=x^2
(square root of 100)=(square root of x^2)
10=x
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