The perimeter of a triangular field is 240dm. If two of its sides are 78dm and 50dm, find the length of the perpendicular on the side of length 50dm from the opposite vertex.

Explanation

To solve the problem step by step, we will follow the outlined process in the video transcript.

### Step 1: Identify the sides of the triangle
We are given:
- Perimeter of the triangle = 240 dm
- Side a = 78 dm
- Side b = 50 dm

...