State whether true or false. Correct the false statement.
a) A median may lie on the exterior of a triangle.
b) Triangle has only one altitude.
c) Altitude of an obtuse angle triangle lies on the exterior of the triangle.
d) Median and altitude of an equilateral triangle are different lines.
e) For a right angle triangle two arms of the right angle are the altitudes of that triangle.
f) One median of an isosceles triangle is a perpendicular bisector of opposite side.