`ABC` is a triangle right angled at `C.` If `AB=25cm and AC=7cm,` find `BC.`

Explanation

To find the length of side \( BC \) in triangle \( ABC \) which is right-angled at \( C \), we can use the Pythagorean theorem. The theorem states that in a right-angled triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the lengths of the other two sides.

### Step-by-Step Solution:

1. **Identify the sides of the triangle:**
- \( AB \) is the hypotenuse, which is given as \( 25 \, \text{cm} \).
- \( AC \) is one of the other sides, given as \( 7 \, \text{cm} \).
- We need to find the length of side \( BC \).
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