Question

three Exterior angles of a quadrilateral is 80°, 100° and 120° then find out fourth interior angle ??

Answer 1

fourth angle is 120 degree by angle sum property of a quadrilateral

Answer 2

Let the other fourth angle be x

As the quadrilateral has four sides,

Sum of angles of a quadrilateral (2n-4)90

Sum of angles of a quadrilateral =(8-4)90

Sum of angles of a quadrilateral =4*90=360

Hence,

80+120+100+x =360

300+x=360

x=360-300

x=60°

Then the Remaining fourth interior angle =x=60°

Then if interior angle is 60°

Then

180-60=exterior angel

120=fourth exterior angle

I hope this much will help you