Question

prove that difference og two sides of a triangle is lesser than the third side​

Answer 1

Let us take a triangle ABC with
Side A = 3cm
Side B = 4cm
Side C = 5cm

Now, B - A cm
4 - 3 = 1 cm
1cm is lesser than 5 cm.
B-A < C

Thus it proves that the difference of two sides is lesser than the third side.