设点C到直线AB的距离为d
由题意知:|AB|=
| [3−(−1)]2+(2−5)2 |
∵S△ABC=
| 1 |
| 2 |
| 1 |
| 2 |
直线AB的方程为:
| y−2 |
| 5−2 |
| x−3 |
| −1−3 |
∵C点在直线3x-y+3=0上,设C(x0,3x0+3)
∴d=
| |3x0+4(3x0+3)−17| | ||
|
| |15x0−5| |
| 5 |
| 5 |
| 3 |
∴C点的坐标为:(-1,0)或(
| 5 |
| 3 |
| [3−(−1)]2+(2−5)2 |
| 1 |
| 2 |
| 1 |
| 2 |
| y−2 |
| 5−2 |
| x−3 |
| −1−3 |
| |3x0+4(3x0+3)−17| | ||
|
| |15x0−5| |
| 5 |
| 5 |
| 3 |
| 5 |
| 3 |