Geometry

Question Analysis

This question focuses on applying the properties of isosceles right - triangles. The main task is to use the relationship between the sides of an isosceles right - triangle to find the value of the unknown side .

 

Key Concept Explanation

In an isosceles right - triangle, the two legs are of equal length. Let the length of each leg be  and the length of the hypotenuse be . According to the Pythagorean theorem (, and since  in an isosceles right - triangle, we have ), the relationship between the leg and the hypotenuse is .

 

Step - by - Step Solution

1. Identify the sides:

In the given triangle, the hypotenuse , and the unknown side  is a leg.

2. Apply the formula:

Using the formula , substitute  and

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