If two sides of a triangle are `hati+2hatj and hati+hatk`, then find the length of the third side.

Explanation

To find the length of the third side of the triangle given the two sides as vectors, we can follow these steps:

### Step 1: Identify the given vectors
The two sides of the triangle are given as:
- Vector **b** = \( \hat{i} + 2\hat{j} \)
- Vector **c** = \( \hat{i} + \hat{k} \)

### Step 2: Set up the equation for the third side
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