Question

can a triangle have angle 70 degree 70 degree and 90 degree​

Answer 1

$\large \sf \green {\boxed {No,\: these \:angles\: are\: not \:possible.}}$

Sum of all angles in a triangle must be equal to 180°

Angles mentioned here is

70°+70°+90° = 140°+90 = 230° which is greater than 180° therefore this condition is not possible.