Fill in the blanks with < or >.
(a) (Sum of any two sides of a triangle)___(the third side).
(b) (Difference of any two sides of a triangle)___(the third side).
(c) (Sum of three altitudes of a triangle)___(sum of its three sides).
(d) (Sum of any two sides of a triangle)___(twice the median to the 3rd side).
(e) (Perimeter of a triangle)___(sum of its three medians).