If `vecaandvecb` are adjacent sides of a rhombus, then `veca.vecb=0`.

Explanation

To determine whether the statement "If \(\vec{a}\) and \(\vec{b}\) are adjacent sides of a rhombus, then \(\vec{a} \cdot \vec{b} = 0\)" is true or false, we can analyze the properties of a rhombus and the dot product of vectors.

### Step-by-Step Solution:

1. **Understanding the Properties of a Rhombus**:
- A rhombus is a type of quadrilateral where all four sides are of equal length.
- The adjacent sides of a rhombus form angles that are not necessarily \(90^\circ\).

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