Question

what is median and altitude of a triangle

Answer 1

Median is the side from midpoint of 1 side joined to vertex of opposite side
Altitude is the line perpendicular to one line and its other end point lie on vertex of other side

Answer 2

the perpendicular line drawn from any vertex of triangle to the opposite side it is altitude.
and the line which join the vertex of a triangle and midpoint of opposite side it is median.