prove the angle sum property of a quadrilateral by cutting and pasting

Dear Student,
To verify , by paper cutting and pasting ,that the sum of interior angles of a quadrilateral is 360 degree.
Materials required :- A coloured sheet of paper , a plane sheet of paper , glue , a pair of scissors,a ruler and a pencil/pen.
Step 1
On a coloured sheet of paper , draw a â€‹quadrilateral ABCD.Name its angles as 1,2,3,4.
Step 2
Make the cutouts of all the four angles using tracing paper , carbon paper and a plane sheet.
Step 3
Paste these  cutouts on a sheet of paper at a point P so that there is no gap between them as shown in fig.

We observe that all angles together forms a complete angle.
Hence the sum of four angles of a quadrilateral is 360 degree.

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