The pythagorean theorem can be used to find any side of a right triangle. The formula is a^2+b^2=c^2. The legs are a& b. the hypotenuse is c. Let's fill in the variables. 6^2+8^2=c^2. Then square the legs. 36+64=c^2 Lets combine like terms. 100=c^2 Then, find the square root to cancel out the square on both sides. Leaving us with 10=c.
The hypotenuse is 10 centimeters long.