Question

Solve 25th question..............

Answer 1

Explanation:

, Let D be the midpoint of BC,
⇒AD is a median of ΔABC
Now we need to prove AB+AC>2AD

  extend AD to E such that AD=DE
⇒AE=2AD,
Draw lines BEandEC,
⇒ABEC is a parallelogram.
⇒BE=AC.
Consider ΔABE
Recall that the sum of any two sides of a triangle is greater than the length of the third side,
⇒AB+BE>AE
⇒AB+AC>2AD ....... (proved)