Show that , if `x^(2)+y^(2)=1`, then the point ` (x,y,sqrt(1-x^(2)-y^(2)))` is at is distance 1 unit form the origin.

Explanation

To show that the point \((x, y, \sqrt{1 - x^2 - y^2})\) is at a distance of 1 unit from the origin, given that \(x^2 + y^2 = 1\), we will follow these steps:

### Step 1: Identify the points
We have two points:
- The origin \(O(0, 0, 0)\)
- The point \(P(x, y, \sqrt{1 - x^2 - y^2})\)

### Step 2: Use the distance formula
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