Hypotenuse is the longest side.
an altitude of a triangle is a line segment through a vertex and perpendicular to a line containing the base.
Altitude is a perpendicular drawn on the base.
Check the length of all the sides.
Plot the mid-point of triangle and then join it with opposite vertex.
Obtuse triangle has one angle as an obtuse angle.
Altitude is a perpendicular drawn to the opposite side.
Angle should be 90 degree.
Triangle has three sides and three corners.