Question

The angles of quadrilateral are $x,{80}^{\circ },{120}^{\circ },{100}^{\circ }$ find $x$

Answer 1

The angles of quadrilateral are $x,80,120,100$

By angle sum property of quadrilateral

$x+80+120+100=360x+300=360x=360-300={60}^{\circ }$