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

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.

Procedure:

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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