How to find the missing side of a right triangle given a 45 45 90 triangle

The video tutorial explains how to calculate the hypotenuse of a right triangle by multiplying the side length by the square root of 2. It then demonstrates how to solve for a variable Y by dividing by the square root of 2 and rationalizing the denominator. The process of rationalizing involves multiplying by the square root of 2 over itself to eliminate the square root from the denominator. The tutorial concludes with simplifying the expression and ensuring both sides are equal.

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