The sides of a triangle are a,b and `sqrt(a^(2)+b^(2)+ab)` then the greatest angle is

Options

A. `60^(@)`
B. `90^(@)`
C. `120^(@)`
D. none of these

Explanation

To solve the problem, we need to find the greatest angle in a triangle with sides \( a, b, \) and \( c = \sqrt{a^2 + b^2 + ab} \).

### Step-by-Step Solution:

1. **Identify the sides of the triangle**:
- Let the sides of the triangle be \( A = a \), \( B = b \), and \( C = \sqrt{a^2 + b^2 + ab} \).

2. **Determine the largest side**:
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