Question

Can we draw a triangle ABC with AB = 3 cm, BC = 3.5 cm and CA = 6.5 cm? Why?

Answer 1

No.

A triangle can be drawn when the sum of any two sides is greater than the third side.
Here, $AB+BC=AC$
i.e., 3+3.5 = 6.5
So, we cannot draw the triangle ABC.