Question

* In the figure, the quadrilateral has been split into two
Show that a+b+c=180°
Continue the proof to show that angles in a quadrilateral add
up to 360°​

Answer 1

The formed figure is a triangle,the sum of angles of a triangle is 180degree.

The sum of angles of two triangles is 360degree. Therefore the sum of angles of a quadrilateral is 360degree