Question

Theorem 7.7 - In any triangle the side opposite to the larger angle is longer.
Is this proof of this theorem is correct ?

Answer 1

"In any triangle, the side opposite to the larger (greater) angle is longer.

This theorem can be proved by the method of contradiction.

Now take a triangle ABC and in it, find AB + BC, BC + AC and AC + AB. What

do you observe?

You will observe that AB + BC > AC,

BC + AC > AB and AC + AB > BC.

Repeat this activity with other triangles"

Answer 2

The proof is correct if you have used the proof by contraction. But you haven't mentioned the case II which I am living to you. I have also changed my diagram according to me so I am pending the whole proof.