Question

please solve it in notebook

Answer 1

if all the angles are less than 60 degrees then the sum will be less than 180 .
but we know that sum of angles in a traingle equals 180 .. so our assumption is wrong .
thus we can't have a triangle with all angles less than 60°

Answer 2

No...As the sums of all the angles of a triangle is 180°.
Therefore, any triangle cannot have all the angles less than 60°.