Let's complete the proof based on the outlined steps:
Step 1: Draw the three medians of the triangle. Draw each median so that it starts at a vertex and ends at the midpoint of the opposite side.
Step 2: Find the coordinates of each midpoint by taking the sum of the x-coordinates and dividing by 2 and taking the sum of the y-coordinates and dividing by 2. The midpoint between (0, 0) and (b, c) is (b/2, c/2). The midpoint of (0, 0) and (a, 0) is (a/2, 0). The midpoint of (a, 0) and (b, c) is ((a+b)/2, c/2).
Step 3: Find the coordinates of P, the point where the medians appear to intersect, on each median. Use the formula (1/3)(vertex) + (2/3)(midpoint).
Step 4:
- Find the coordinates of P on the median that starts at vertex (0, 0) and ends at midpoint ((a+b)/2, c/2). \[ P = \frac{1}{3}(0, 0) + \frac{2}{3}\left(\frac{a+b}{2}, \frac{c}{2}\right) = (0, 0) + \left(\frac{a+b}{3}, \frac{c}{3}\right) = \left(\frac{a+b}{3}, \frac{c}{3}\right) \]
- Find the coordinates of P on the median that starts at vertex (a, 0) and ends at midpoint (b/2, c/2). \[ P = \frac{1}{3}(a, 0) + \frac{2}{3}\left(\frac{b}{2}, \frac{c}{2}\right) = \left(\frac{a}{3}, 0\right) + \left(\frac{b}{3}, \frac{c}{3}\right) = \left(\frac{a+b}{3}, \frac{c}{3}\right) \]
- Find the coordinates of P on the median that starts at vertex (b, c) and ends at midpoint (a/2, 0). \[ P = \frac{1}{3}(b, c) + \frac{2}{3}\left(\frac{a}{2}, 0\right) = \left(\frac{b}{3}, \frac{c}{3}\right) + \left(\frac{a}{3}, 0\right) = \left(\frac{a+b}{3}, \frac{c}{3}\right) \]
Step 5: The coordinates of P on each median are \(\left(\frac{a+b}{3}, \frac{c}{3}\right)\), which proves that the three medians of this generic triangle all intersect at the same point.