Question

Pls help me with this. You don't need to show your work.

Answer 1

$(a+b)^\circ=108^\circ\\\\2a^\circ=b^\circ$

so:

$(a+b)^\circ=(a+2a)^\circ=3a^\circ=108^\circ\\\\a^\circ=36^\circ$

and

$b^\circ=108^\circ-a^\circ=108^\circ-36^\circ=72^\circ\\\\\boxed{m\angle QNS=b^\circ=72^\circ}$