An Altitude is a line segment:
Whose one end is at vertex of a triangle
Whose other end is on the opposite side of aforementioned vertex
Which is perpendicular to this opposite side
Example: In the following Triangle ABC:
AD is a line segment:
Whose one end is at vertex ‘A’ of a triangle
Whose other end ‘D’ is on the opposite side ‘BC’ of vertex ‘A’
Which is perpendicular to the opposite side ‘BC’
Hence, AD is an altitude of Triangle ABC.
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