If A=B+C have scalar magnitudes of 5,4,3 units respectively , then find the angle between A and C.

Explanation

To solve the problem of finding the angle between vectors A and C given that \( A = B + C \) with magnitudes \( |A| = 5 \) units, \( |B| = 4 \) units, and \( |C| = 3 \) units, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the relationship between the vectors**:
We know that \( A = B + C \). This can be rewritten in terms of magnitudes as:
\[
|A|^2 = |B|^2 + |C|^2 + 2|B||C|\cos\theta
...