Find `BC,` if the area of the triangle `ABC` is `36cm^2` and the height `AD` is `3cm` (Fing 11.21)

Explanation

To find the length of side \( BC \) in triangle \( ABC \) given that the area is \( 36 \, \text{cm}^2 \) and the height \( AD \) is \( 3 \, \text{cm} \), we can follow these steps:

### Step 1: Write down the formula for the area of a triangle.
The area \( A \) of a triangle can be calculated using the formula:
\[ A = \frac{1}{2} \times \text{base} \times \text{height} \]
In this case, the base is \( BC \) and the height is \( AD \).
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