Answers

2015-09-18T17:52:16+05:30
The shortest distance from a point to a line is the perpendicular. Hence each altitude is shorter than both of the triangles sides that that are incident at the angle the altitude is from. I.e. Altitude from A is shorter than both b and c, altitude from B is shorter than both both a and c, the altitude from C is shorter than both a and b. Now adding selectively the result follows.
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